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11 Cards in this Set
- Front
- Back
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Does the resting membrane potential of a neuron change if the extracellular K+ is increased from 4nM to 6nM? |
Yes. The resting membrane potential moves towards threshold (depolarization) |
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What is responsible for the repolarization phase of an action potential in a nerve? |
The efflux of potassium ions via the voltage gated potassium channel |
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An exitatory post synaptic potential (EPSP) differs from an inhibitory post synaptic potential (IPSP) because the EPSP: |
is a depolarizing potential |
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How can the neurotransmitter norepinephrine be correctly described? |
It is secreted by the sympathetic nervous system and it binds to adrenergic receptors on the post synaptic cell |
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Rob was diagnosed with a disease in which the peripheral neurons lose their myelin sheath. In this disease, voluntary movement of the limbs is slowed because |
the axon conductance is slowed |
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Describe action potentials |
Has a threshold and is only an excitatory event |
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A nerve fiber has a resting potential of -70mV and a threshold potential of -55mV. What is most likely to generate an action potential? |
+20mV EPSP |
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Which channels must be localized to the node of Ranvier for normal propagation of the action potential along the axon? |
voltage gated K+ channel and voltage gated Na+ channel |
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When the membrane of the axon terminal depolarizes: |
Ca+ enters the nerve terminal |
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When chemically gated Cl- channels open in a neuron with a resting membrane potential of -55mV |
Chloride ions enter the cell moving the membrane potential further from threshold |
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At what rate would the impulse conduction be greatest? |
a myelinated fiber 20 microns in diameter |
