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25 Cards in this Set
- Front
- Back
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Place the following in order for chemical synapse transmission: 1. Ca2+ enters axon terminal 2. Ligand-gated ion channels open in postsynaptic membrane 3. Neurotransmitter binds to postsynaptic receptor 4. Action potential reaches axon terminal of presynaptic neuron 5. Neurotransmitter released by exocytosis |
4, 1, 5, 3, 2 4. Action potential reaches axon terminal of presynaptic neuron 1. Ca2+ enters axon terminal 5. Neurotransmitter released by exocytosis 3. Neurotransmitter binds to postsynaptic receptor 2. Ligand-gated ion channels open in postsynaptic membrane |
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Which glial cell(s) is/are only found in the peripheral nervous system |
Schwann cells |
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At what point in this action potential diagram does the onset of Na+ channel inactivation stop the inward flow of Na+? |
B |
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Which of the following structures is NOT actively involved with saltatory conduction? |
Na+/K+ pumps |
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The binding of a neurotransmitter to ligand-gated Na+ channels will cause ______ in the postsynaptic membrane |
depolarization |
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Which of the following does NOT involve K+? |
depolarization |
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When the threshold potential is reached, which of the following occurs? |
The activation gates of Na+ channels open |
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The binding of a neurotransmitter to ligand-gated K+ channels will cause _______ in the postsynaptic membrane |
hyperpolarization |
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For which axon might you expect action potential propagation to be the fastest? |
a myelinated axon with a large diameter |
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The refractory period of a neuron plasma membrane is important because |
it ensures that an impulse will travel in a one-way direction |
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If the K+ channels of an excitable plasma membrane were blocked by the action of a drug, which of the following would be disrupted? |
repolarization and hyperpolarization |
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A graded, subthreshold change in the postsynaptic membrane potential that moves it toward threshold is called a(n) |
EPSP |
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At what point in this action potential diagram are Na+ inactivation gates opening and K+ activation gates closing? |
D |
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The transmission of information from one neuron to another has been found to occur by all of the following mechanisms EXCEPT |
chemical signals transmitted through electrical connections |
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The binding of a neurotransmitter to ligand-gated Cl- channels will cause ______ in the postsynaptic membrane |
hyperpolarization |
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Action potentials are propagated in a one-way direction down a neuron plasma membrane because |
the adjacent channels upstream from the action potential are in their refractory period |
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The disease multiple sclerosis causes myelin degeneration in vertebrate nervous systems. Knowing this, what symptoms/effects might you NOT expect in a person with MS? |
memory loss |
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During an action potential, the membrane potential can reach as high as |
+30mV |
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The neuron resting membrane potential is established due to all of the following EXCEPT |
the distribution of ions inside and outside an axon |
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What neuron location has the greatest density of voltage-gated Na+ channels, resulting in the lowest threshold potential along a neuron? |
axon hillock |
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In vertebrates, the neurotransmitter acetylcholine |
a and b only a. can act as a direct neurotransmitter between neurons and muscle cells b. can make it more difficult for some postsynaptic membranes to reach threshold |
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Assume a neuron receives EPSPs and IPSPs from several adjacent neurons. How might that neuron's threshold potential be reached, causing it to produce its own action potential? |
temporal and spatial summation |
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Which of the following components of a neural signaling pathway are correctly arranged from beginning to end? |
reception, transmission, integration, transmission, response |
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Which cells are part of the vertebrate peripheral nervous system? |
afferent, motor and efferent neurons |
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The minimum level of depolarization required to initiate an action potential in an excitable cell is called the |
threshold potential |
