The statement "because voltage-gated ion channels open when membrane potential passes a particular level" is the most accurate explanation for why an action potential is an all-or-none response to stimuli. So, option B is accurate.
Action potentials are produced and propagated by voltage-gated ion channels in neurons. Normally closed at rest, these ion channels have the ability to open in response to changes in the membrane potential. Voltage-gated ion channels open, enabling an inflow of ions (such as sodium) into the cell, when the membrane potential depolarizes, that is, when it gets less negative and reaches a specific threshold level. The action potential is produced as a result of this quick change in the membrane potential brought on by the rapid influx of ions.
The action potential is produced and transmitted along the neuron's axon once the threshold is crossed and the voltage-gated ion channels open. The power or length of the first stimulus usually has no effect on the size or duration of the action potential. This is why the action potential is known as an all-or-none response, denoting that it either responds to a stimulus fully or not at all.
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The actual question is:
why is an action potential an all-or-none response to stimuli?
a) because a typical neuron receives signals through multiple dendrites but transmits signals through a single axon
b) because voltage-gated ion channels open when membrane potential passes a particular level
c) because neurons contain gated ion channels that are either open or closed
d) because voltage-gated ion channels close when membrane potential passes a particular level
in what type of cell, gram-positive or gram-negative, would you find lipopolysaccharide in its cell wall? where is this found, and why is it clinically relevant?
The lipopolysaccharide is present in the cell wall of Gram-negative bacteria. It is present outside surrounding the thin peptidoglycan cell wall. The lipopolysaccharide is clinically relevant because it acts as a permeability barrier preventing the passive diffusion of hydrophobic solutes.
Lipopolysaccharide is the main component of the cell wall of the Gram negative bacteria. It is negatively charged molecule and helps in stabilizing the overall membrane structure of the bacteria.
Gram-negative bacteria are the bacteria which do not retain the stain of crystal violet. This happens due to the specific cell wall structure of the bacteria. The lipid layer of the Gram-negative bacteria dissolves upon the use of solvent and therefore the stain is not retained.
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Results for "even though Brenda was never reinforced directly for doing so, she increased the frequency of her swearing after she saw her friend Elizabeth get a lot of attention after she swore. This is most likely an example of a"
Which sentence is the best example of homeostasis?
OA. A coyote howls to alert other members of its pack that it is time to meet.
OB. A migratory bird returns to its nesting spot each year to mate.
OC. A caterpillar spins a cocoon around itself with silk that is produced by glands in its body.
OD. A cold-blooded lizard lies on a warm rock to increase its body temperature
Which of the following events would most likely contribute to lowering the carrying capacity of a population?
B. Habitat loss brought on by human development or natural disasters. The carrying capacity may be decreased by resource degradation and overuse during an overshoot era or increased by technology and societal advancements.
The number of individuals of a certain species that the resources of a region can support eternally without suffering severe depletion or degradation is known as carrying capacity. The carrying capacity of the majority of organisms can be calculated easily. Carrying capacity for humans is significantly more complicated. The term is widened to encompass refraining from hurting the physical environment in ways that might have a negative impact on future generations as well as refraining from degrading our cultural and social settings.
Once this happens, the population size varies slightly above or below the carrying limit. Population growth could be impacted by a reproductive lag
The complete question is:
Which of the following events would most likely contribute to lowering the carrying capacity of a population?
A.an increase in the water supply in the habitat
B. a decrease in habitats due to human development or natural disasters
C.an increase in the number of predators who eat the animal
D. a decrease in the number of females in the population
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The black paper ________________ all of the colors of the light spectrum so you do not see any colors.
absorbs
reflects
refracts
bends
Answer:
Absorbs
Explanation:
Black objects absorb all colours so no light is reflected.
8. why are the forelimbs of frogs, rabbits, birds, and other tetrapods (4-limbed animals, including us!) considered homologous structures, even though they look so different?
Answer:
The Bone Structure are similar which means we have common ancestor
Explanation:
The forelimbs of frogs, rabbits, birds, and other tetrapods are considered homologous structures because they share a common evolutionary origin, despite their differences in appearance and function.
Homologous structures have a similar underlying anatomical organization, derived from a common ancestor, but may have adapted for different purposes over time.
Step-by-step explanation:
1. Homologous structures are those that have a similar anatomical organization due to shared ancestry, even though they may look different or perform different functions.
2. Frogs, rabbits, birds, and other tetrapods are all descendants of a common ancestor, which had four limbs.
3. Over time, these tetrapods evolved and adapted to their specific environments and needs, causing their forelimbs to develop different shapes and functions.
4. For example, frogs' forelimbs are adapted for jumping, rabbits' for running, and birds' for flying. However, their underlying skeletal structures show similarities, indicating a common evolutionary origin.
5. By comparing these homologous structures, we can learn about the evolutionary history of these species and understand how they have adapted to their specific niches over time.
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a/an organelle may become specialized and may aggregate with others of its kind to form greater levels of organization
A/An Cell Organelle may become specialized and may aggregate with others of its kind to form greater levels of organization.
An organelle is a subcellular structure that, like an organ in the body, has one or more specialized tasks to carry out within the cell. The nucleus, which house genetic material, the mitochondria, which generate chemical energy, and the ribosomes, which put together proteins, are some of the most significant cell organelles.
An organelle is a specialized component with a particular function that is often found within a cell in cell biology. The suffix -elle, a diminutive, in the word organelle, refers to the concept that these structures are components of cells, much like organs are to the body.
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what happens during a heart attack? group of answer choices blood pools in the lower extremities. blood supply to some area of the brain is interrupted. the heart pumps at an excessively rapid rate. blood supply is blocked to some area of the heart.
During a heart attack, option D: blood supply is blocked to some area of the heart.
Blood flow to a portion of your heart ceases or is significantly reduced during a heart attack, which damages or kills that portion of your heart muscle. If a portion of your heart is unable to pump because it is dying from a lack of blood flow, the entire pumping cycle of your heart may be hampered.
A myocardial infarction, often known as a heart attack, is a very hazardous ailment that develops when the blood supply to your heart muscle is cut off. Although there are numerous potential causes, a blockage in one or more of your heart's arteries is the most common one.
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Complete question:
what happens during a heart attack? group of answer choices
blood pools in the lower extremities.
blood supply to some area of the brain is interrupted.
the heart pumps at an excessively rapid rate.
blood supply is blocked to some area of the heart.
trichomonas vaginalis can be distinguished from other parasitic protozoa by which of the characteristics listed below? trichomonas vaginalis can be distinguished from other parasitic protozoa by which of the characteristics listed below? it is a photosynthetic organism that lives in fresh water. it infects anopheles mosquitoes and can be transmitted by a bite. it is usually found in drinking water and is associated with fecal contamination. it has an undulating membrane, infects the vagina, and is frequently transmitted by sexual contact.
The undulating membrane of trichomonas vaginalis denotes it from other parasitic protozoa because it infects the vagina and is frequently transmitted through sexual contact. The fish tapeworm's life cycle is comparable to that of the beef tapeworm.
Flagellates include Giardia, Trichomonas, Chilomastix, and Dientamoeba; Isospora and Cryptosporidium are coccidia, while Balantidium coli is a ciliate.
Low-grade inflammation and persistent vaginitis are brought on by Trichomonas vaginalis, which causes the deterioration of the cells that make up the vaginal mucosa. The condition is characterized by persistent burning and itching in addition to a yellowish discharge.
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what was most likely responsible for the disappearance of the dinosaurs? group of answer choices urban development background extinction commercial exploitation mass extinction introduction of invasive species
The most likely responsible for the disappearance of the dinosaurs is the mass extinction.
The extinction of the dinosaurs was a significant event that occurred about 66 million years ago. The leading theory is that the extinction was caused by a massive asteroid impact that resulted in a global environmental disaster. The asteroid impact caused huge fires, tsunamis, and an impact winter, leading to the extinction of the dinosaurs and about 75 percent of all plant and animal species on Earth.
The mass extinction theory is supported by extensive geological and fossil evidence, which shows a sudden and widespread disappearance of dinosaurs and other species around the same time as the asteroid impact. Therefore, it is widely accepted that the mass extinction event caused by an asteroid impact was the most likely cause of the disappearance of the dinosaurs.
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a scientist measures the circumference of acorns in a population of oak trees and discovers that the most common circumference is 2 cm. what would you expect the most common circumference(s) to be after 25 generations of strong directional selection? 2cm greater than 2cm and less than 2cm none of these options greater than 2cm or less than 2cm
The most common circumference after 25 generations of strong directional selection would be option C: greater than 2cm or less than 2cm.
The most usual circumference after 25 generations of strong would be greater than 2cm or less than 2cm. This is due to the fact that strong directional selection would force the population to change in favor of the acorn circumference in this scenario. Strong directional selection over 25 generations should produce circumferences that are more common than or less common than 2 cm.
Directional selection occurs when people at one end of the curve are more favored than people in the middle or at the other end due to their superior fitness.
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Correct question is:
A scientist measures the circumference of acorns in a population of oak trees and discovers that the most common circumference is 2 cm. what would you expect the most common circumference(s) to be after 25 generations of strong directional selection?
2cm
greater than 2cm and less than 2cm
greater than 2cm or less than 2cm
none of these options
the characteristic that enabled homo erectus to survive during the pleistocene almost certainly was its: group of answer choices physical adaptation to cold adaptive flexibility made possible by culture ability to migrate out of cold regions subsistence emphasis on big game hunting
Homo erectus survived the Pleistocene due to the characteristic: (2) flexibility made possible by culture.
Pleistocene is the epoch in the geological time scale which lasted from about 2,580,000 to 11,700 years ago. It was referred to as the Ice Age because during this time the earth was covered with glaciers. It is said to be the most recent period of glaciation of the earth.
Homo erectus are the extinct species of humans. They lived during the Pleistocene epoch. They are said to be the first recognizable members of the Homo family. The main reason for the extinction of these species was the change in environment. The ones who were able to adapt survived and resulted in the evolution into current humans.
Therefore the correct answer is option 2.
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which of the following statements about enzymes is not true? they do not affect the position of a reaction's equilibrium. they work by increasing the activation energy of a biochemical reaction. they increase the rate at which a reaction's equilibrium is attained. they need to be in their native conformation in order to be active. they decrease the activation energy of a biochemical reaction.
Answer:
they work by increasing the activation energy of a biochemical reaction.
Explanation: Enzymes are biological catalysts responsible for speeding up biochemical reactions. They do this by reducing the activation energy required for the reaction to proceed, not by increasing it. By lowering the activation energy, enzymes increase the rate at which a reaction's equilibrium is attained, allowing reactions to occur more rapidly and efficiently in living organisms.
The statement that is not true about enzymes is: they work by increasing the activation energy of a biochemical reaction. In fact, enzymes decrease the activation energy of a biochemical reaction, facilitating the development of the reaction.
What are enzymes?Enzymes are biological catalysts that accelerate chemical reactions in living organisms. They increase the rate of chemical reactions by decreasing the activation energy required for the reaction to occur. Without enzymes, many biological processes would not occur at a fast enough rate to sustain life.
Enzymes are often very specific to the reaction they catalyze and are essential for the proper functioning of many biological systems. Thus, enzymes decrease the activation energy of a biochemical reaction.
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during mammalian labor and delivery, the contraction of uterine muscles is enhanced partly by the actions of oxytocin. this is an example of
During mammalian labor and delivery, the contraction of uterine muscles is enhanced partly by the actions of oxytocin. This is an example of a positive feedback mechanism. In such a mechanism, the output or product of a process enhances or amplifies the initial stimulus, resulting in a greater response.
In the context of labor and delivery, oxytocin is a hormone that is released from the posterior pituitary gland. It plays a crucial role in the regulation of uterine contractions. When labor begins, the baby's head pushes against the cervix, causing it to stretch. This stretching triggers nerve signals that are sent to the brain, which in turn stimulates the release of oxytocin.
As oxytocin levels increase in the bloodstream, it binds to specific receptors on the uterine muscle cells, causing them to contract. These contractions help to further dilate the cervix and push the baby down the birth canal.
As the cervix continues to stretch, more oxytocin is released, leading to stronger and more frequent contractions. This process continues until the baby is fully delivered, at which point the stimulus for oxytocin release is removed and the feedback loop ends.
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tetanus is a bacterial infection that is commonly acquired from puncture wounds. why do you need to be vaccinated against the flu every year, but you only need a virus booster against tetanus every 10 years?
The need for annual vaccination against the flu and less frequent tetanus boosters is due to the differences in the biology of the two diseases and the characteristics of the pathogens that cause them.
Tetanus is a bacterial infection which is caused by the bacterium Clostridium tetani. The tetanus vaccine is a toxoid vaccine, which means that it is made from inactivated toxin produced by the bacteria rather than from the bacteria themselves. The vaccine works by stimulating the immune system to produce antibodies against the tetanus toxin, which provides protection against the disease.
The tetanus vaccine provides long-lasting protection against tetanus, which is why a booster shot is only needed every 10 years. This is because the immune system "remembers" the previous exposure to the vaccine and is able to mount a rapid response when re-exposed to the toxin.
In contrast, the flu vaccine needs to be updated every year because the influenza virus undergoes frequent mutations, resulting in different strains of the virus circulating each year. This means that the previous year's flu vaccine may not provide effective protection against the current year's flu strains. Therefore, a new vaccine that is specific to the current year's strains is needed every year.
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Dean needs to lift the rock shown in the picture above. He wants to use the lever to lift the rock while using the least amount of effort force.
At which position should Dean push on the lever?
Answer:
Position B is which is the X. The first one is where we can move the rock with a little bit of power. If we do Y and Z, the rock will fly off, but if you do W, nothing happens. So, the correct option is B.
Explanation:
what is the reason that closely linked genes are typically inherited together? the number of genes in a cell is greater than the number of chromosomes.
The reason that closely linked genes are typically inherited together is that the number of genes in a cell is greater than the number of chromosomes. The genes are inherited through the chromosomes in the cell.
The chromosomes can have one or more genes that are closely linked, which means they are located close to each other on the same chromosome.Closely linked genes are typically inherited together because they are physically located close to each other on the same chromosome, and the chromosome is passed down to the offspring intact during cell division. This phenomenon is called genetic linkage.
When two genes are located close together on a chromosome, they are more likely to be inherited together because the likelihood of crossing over between the two genes is lower.
During meiosis, when the chromosome pairs line up and exchange genetic material, the closer the genes are to each other, the less likely they are to be separated. This is because crossing over events are more likely to occur between genes that are farther apart, resulting in recombination between the two chromosomes.
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why is neuromuscular electrical stimulation (nmes) able to provide stronger neuromuscular stimulation?
Neuromuscular electrical stimulation (NMES) involves the use of electrical currents to stimulate muscle contractions.
The process of stimulating muscle contractions with electrical currents is known as neuromuscular electrical stimulation (NMES). Because it directly engages the motor neurons that govern muscle contraction, avoiding the need for deliberate activation by the brain, this approach can produce stronger neuromuscular stimulation.
The motor neurons in the spinal cord are activated when a muscle contracts voluntarily as a result of brain impulses. Yet, NMES can be used to directly stimulate the motor neurons and cause muscular contractions when the brain is unable to provide these signals, as is the situation in some neurological conditions or after specific traumas.
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Match the correct captions to the pictures showing areas of fast-moving and slow-moving water.
Answer: D, B, A, C
Explanation: This is the answer moving from the top of the image to the bottom.
Which information helps scientists determine the survival probability of a population
Scientists can determine the survival probability of a population by studying various factors such as birth rate, death rate, migration, environmental conditions, genetic diversity, and population size.
How do scientists use population data to determine the survival probability of a species?Scientists use population data to analyze trends such as population size, density, age structure, and reproduction rates to estimate the survival
What factors can affect the survival probability of a population?
Various factors can affect the survival probability of a population, including changes in habitat, availability of resources, predation, disease, climate change, and human activities such as hunting and pollution.
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why does a positive pregnancy test have two pink stripes? why does a positive pregnancy test have two pink stripes? one stripe tests for the hormone, and the other stripe indicates how much hormone is present. the second pink stripe indicates whether white blood cells are attacking the pregnancy antibodies. one stripe binds to the hormone, and the other stripe is a control zone. each stripe binds to the same hormone to indicate a positive pregnancy.
A positive pregnancy test has two pink stripes because one stripe binds to the hormone, and the other stripe is a control zone. Each stripe binds to the same hormone to indicate a positive pregnancy.
The two stripes on a pregnancy test indicate a positive result, which means that the urine sample contains a hormone called human chorionic gonadotropin (hCG). One stripe on the test is a control line that is always present, and it indicates that the test is working correctly.
The other stripe is the test line, which binds to the hCG hormone in the urine sample. If hCG is present in the urine, it will bind to both the control line and the test line, causing the test line to turn pink, indicating a positive result.
Therefore, the two pink stripes on a positive pregnancy test are a result of the hCG hormone binding to both the control and test lines.
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How does the presence of differently oriented magnetic bands of oceanic rock support the theory of plate tectonics?
Thank you to anyone who helps :))
A new stripe with a new polarity starts as the Geomagnetic field flips. Such magnetic patterns are among the greatest pieces of evidence supporting the hypothesis of plate tectonics.
How is plate tectonics supported by magnetic orientation?The revelation that rocks just on seafloor preserve ancient magnetic field reversals was one of the most important pieces of evidence for plate tectonic theory. As rocks form where plates are drifting apart, they preserve the present direction of the magnetic field of the Earth, which flip-flops.
Which hypothesis describes the magnetic orientation in rock samples?The study of the magnetic field of the Earth as preserved in rocks is known as palaeomagnetism. In the nineteenth century, scientists learned that some minerals have the potential to develop with magnetic fields parallel to those of the Earth.
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How does the excretory system respond when blood pH gets too low?
A. The liver makes more digestive fluids.
B. The kidneys filter more acid from the blood.
C. The stomach produces more hydrochloric acid.
D. The lungs exhale less carbon dioxide
what patterns in fossil record indicate that there have been changes of a particular spieces over time
One of the most important patterns in the fossil record that indicates such changes is the presence of transitional fossils.
The fossil record provides a wealth of information about the history of life on Earth, including the changes that have occurred in particular species over time.
These are fossils that exhibit characteristics of both an ancestral and a descendant species, indicating that the species underwent evolutionary change over time.
Another pattern that can indicate changes in a particular species over time is the presence of fossils in different geological layers. If a particular species is found in different geological layers, and the fossils in each layer exhibit different characteristics, it suggests that the species evolved and changed over time.
Finally, the pattern of extinction can also provide evidence of changes in a particular species over time. If a species is known to have gone extinct, it is likely that its characteristics changed over time, and it was unable to adapt to changing environmental conditions, leading to its eventual demise.
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with respect to rna processing, which of the following is false? question 8 options: rna processing leads to the production of alternative gene products. some introns are removed by spliceosomes. some introns are self-splicing.
The enzyme reverse transcriptase produces DNA enzymatically from an RNA template during reverse transcription. The RNA processing processes do not involve this enzyme.
What is an illustration of a gene?Many of your characteristics, like your skin tone and hair color, are determined by the genes you inherit. Perhaps Emma's mother carries two genes—one for brown hair as well as one for red hair—and she gave Emma the red hair gene. if both of her father's red hair genes are present.
How do genes and DNA differ from one another?Your human anatomy is constructed and preserved by DNA. Genes are parts of your DNA that give you the physical traits that make you special.
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which is the correct spelling of the term describing the process of inserting a tube through the urethra and into the urinary bladder?
The correct spelling is urinary catheterization.
Catheterization is defined as the process of inserting a tube through the urethra which goes up to the urinary bladder and provides the passage for urine.
It is usually done to patients who have a blockage in their urinary tracts which makes them unable to urinate or to bedridden patients who are not allowed to move from the bed. This process is done by nurses and doctors.
The tube which is inserted into the urinary tract is known as a urinary catheter and it's a flexible silicone tube that empties the urinary bladder into a drainage bag.
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The word "catheterization," which refers to the procedure of putting a tube through the urethra and into the bladder of the patient, is the proper spelling.
Catheterization is a medical procedure that involves inserting a thin, flexible tube called a catheter into the bladder through the urethra. This is done to remove urine from the body when a person is unable to do so naturally or needs to have their bladder drained for medical reasons. The procedure is often performed in hospitals, clinics, or other healthcare settings under sterile conditions to prevent infection. It is important to follow proper hygiene and medical protocols when performing catheterization to avoid complications such as urinary tract infections or damage to the urinary system.
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Outline the steps of a practical photosynthesis investigation.
Photosynthesis is the process by which photoautotrophs convert light energy into chemical energy which can later be used as a fuel for the activities of organisms.
The sunlight is absorbed by the chlorophyll in the leaves of the plants. Carbon dioxide enters the plant through structures called the stomata, which are usually found on the underside of the leaves. Water is absorbed through the roots of the plant.
The light-dependent reaction occurs during the day. At this stage, water is spilt into its elements – oxygen and hydrogen ions. Then, the ions go through a series of electron carriers, eventually leading to the accumulation of hydrogen ions. As electrons get transferred from one electron carrier to another, energy is released. In this case, ATP & NADPH are released.
The light Independent reaction uses the energy produced during light depending on the reaction to transform carbon dioxide into glucose. The transformation from carbon dioxide to glucose requires a few reactions. The same molecule produces glucose during this process.
The lower parts of the leaves have rather “spaced out” cells. This structure permits carbon dioxide to permeate into other parts of the leaves, thereby facilitating the release of oxygen.
in guinea pigs, black coat color is dominant over white coat color. the offspring of a mating between 2 heterozygous black guinea pigs would probably show a genotype ratio of:
The offspring of a mating between two heterozygous black guinea pigs would probably show a genotype ratio of 1:2:1.
When it comes to genetic cross or crossing, one can determine the possible offspring's phenotype and genotype by using a Punnett square. A Punnett square is a grid used to determine the possible genotypes of the offspring of a mating. The Punnett square is named after Reginald C. Punnett, who developed the method in 1905. The Punnett square displays all the possible outcomes of a genetic cross. Each box in the grid represents a possible combination of alleles.
Here is how we can use the Punnett square to determine the possible genotype ratio of the offspring of a mating between two heterozygous black guinea pigs. Heterozygous means that they carry different alleles for a gene. In this case, they are both carrying the dominant black coat color gene (B) and the recessive white coat color gene (b), which means they are Bb.
To make the Punnett square, you will place the alleles of one parent on the top of the grid and the alleles of the other parent on the left side of the grid. Each box in the grid represents a possible combination of alleles for the offspring.
In this case, we are dealing with two heterozygous black guinea pigs, which means that both parents are Bb. When we fill in the Punnett square, we get the following:
| | B | b |
| - | - | - |
| B | BB | Bb |
| b | Bb | bb |
The possible offspring genotypes are BB, Bb, and bb. Since black coat color is dominant over white coat color, the offspring with the BB and Bb genotypes will have black coats, while the offspring with the bb genotype will have a white coat.
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. if the intracellular and extracellular concentration of ion-a are equal, ion-a is the only ion in the neuron, and the neuron is only permeable to ion-a, what is ion-a's equilibrium potential?\
If the intracellular and extracellular concentration of ion-a are equal and ion-a is the only ion in the neuron, the neuron is at equilibrium, and there is no net movement of ion-a across the membrane. At equilibrium, the membrane potential of the neuron is equal to the equilibrium potential for ion-a.
The equilibrium potential of an ion is determined by the Nernst equation:
Eion = (RT/zF)ln([ion]out/[ion]in)
where R is the gas constant, T is the temperature in Kelvin, z is the valence of the ion (in this case, 1), F is Faraday's constant, [ion]out is the extracellular concentration of ion-a, and [ion]in is the intracellular concentration of ion-a.
Since the intracellular and extracellular concentrations of ion-a are equal, [ion]out/[ion]in = 1, and ln([ion]out/[ion]in) = 0. Therefore, the equation reduces to:
Eion = (RT/zF)ln(1) = 0
This means that the equilibrium potential for ion-a is 0 mV. At this potential, there is no net movement of ion-a across the membrane, and the neuron is at equilibrium.
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which is the correct sequence of signals starting with an action potential in a motor neuron and ending with calcium release?
The correct sequence of signals starting with an action potential in a motor neuron and ending with calcium release is:
An action potential is generated in the motor neuron.
The action potential travels down the axon of the motor neuron and reaches the axon terminal.
The arrival of the action potential at the axon terminal triggers the opening of voltage-gated calcium channels.
Calcium ions flow into the axon terminal down their concentration gradient.
The increase in calcium ion concentration in the axon terminal triggers the fusion of synaptic vesicles with the presynaptic membrane.
Neurotransmitters are released into the synaptic cleft.
The neurotransmitters bind to receptors on the postsynaptic membrane.
This binding causes the opening of ligand-gated ion channels in the postsynaptic membrane, which allows ions to flow into or out of the cell.
The resulting change in membrane potential in the postsynaptic cell may generate a new action potential, which will propagate down the next neuron in the pathway, or will trigger a response in the effector cell if the postsynaptic cell is a muscle or gland.
Calcium ions that entered the axon terminal during step 4 are actively pumped out of the axon terminal, and the synaptic vesicles are recycled and refilled with neurotransmitters, in preparation for the next action potential.
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