Consider fast acting voltage-gated potassium channels that inactivate and slow acting voltage-gated sodium channels that do not. These channels have equal threshold levels and also open in hyperpolarization conditions. What would happen to the membrane potential during action potentials when the potassium channels open and close?
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Put the steps of the action potential in order. Voltage gated K channels open Stimuli received by a receptor Voltage gated Na channels close Na channels open (graded potential) Repolarization Overshoot/hyperpolarization Depolarization occurs rapidly Threshold is reached Voltage gated Na channels open
Shyam P.
The rapid repolarization of the membrane in an action potential is caused by none of the above opening of voltage-gated K+ channels in response to peak depolarization closing of the slow inactivation gates on Na+ channels opening of voltage-gated K+ channels in response to the initial threshold depolarization opening of voltage gated Ca2+ channels in the axon terminal
Rupsa S.
Action potentials occur when ________. a. potassium gates close b. a stimulus pushes membrane potential to threshold c. sodium-potassium pumps become active d. neurotransmitter is reabsorbed
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