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22 Cards in this Set
- Front
- Back
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In the body, APs are initiated at one end of the axon and conducted away from... |
that point toward the axon's terminals |
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Once initiated, an AP is ________ and continues along the axon at ________ |
-self-propagating -constant velocity |
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the repolarization wave ________ the depolarization wave down the length of the axon |
chases |
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local current flows decline with distance because the charges ________ |
leak through the membrane |
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once generated, all APs are independent of ________, and all APs are ________. |
stimulus strength alike |
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strong stimuli generate nerve impulses more ________ than do weak impulses |
often in a given time interval |
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stimulus intensity is coded for by ________ |
number of impulses per second (frequency of action potentials) |
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the permeabilities of Na+ and K+ across the membrane are ________ |
different (more permeable to potassium)` |
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the value of the resting membrane potential varies from ________ |
-40mV to -90mV |
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resting potential exists only ________. Bulk solutions inside and outside cell are ________. |
-across the membrane -electrically neutral |
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the ________ provide the resistance to current flow |
plasma membranes |
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the electrical and concentration gradients constitute the ________ |
electrochemical gradient |
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in extracellular fluid, sodium ions are are balanced chiefly by ________ |
chloride ions |
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________ plays the most important role in generating the membrane potential |
potassium |
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the resting permeabilities reflect the properties of the ________ in the membrane |
leakage ion channels |
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at resting membrane potential, negative interior of cell is due to ________ |
a much greater ability for K+ to diffuse out of cell than Na+ to diffuse into cell |
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E_K = E_Na = V_mr = |
E_K = -90mV E_Na = +30 mV V_mr = -70mV |
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Na+/K+ ATPase pump saves us from the ________ that would have occurred what's pumped in and out respectively? |
decay 3 Na+ out 2 K+ in |
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chemically-gated ion channels open in response to ________ the term for this is ________ these are found in ________ |
binding of appropriate neurotransmitter at receptor paratactic dendritic and somatic membranes |
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postsynaptic potential is when stimulus is a ________ released by ________ |
neurotransmitter another neuron |
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voltage-gated ion channels open when ________ changes in a certain way found in ________ |
voltage across membrane axonal and axon terminal |
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during the relative refractory period, most Na+ channels have returned to ________ |
their resting state |
