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
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Step 1: At the peak of depolarization during an action potential, the inactivation gate of voltage-gated potassium channels opens. Show more…
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In the propagation of a nerve impulse: a. the refractory period begins as the $\mathrm{K}^{+}$ channel opens, allowing $\mathrm{K}^{+}$ ions to flow outward along their concentration gradient. b. $ \mathrm{Na}^{+}$ ions flow out of the axon with their concentration gradient. c. positive charges lower the membrane potential to its lowest action potential. d gated $\mathbb{K}^{+}$ channels open at the same time as the activation gate of $\mathrm{Na}^{+}$ channels closes. the depolarizing stimulus lowers the membrane potential to open the Na $^{+}$ gates.
The opening of axon membrane voltage-gated potassium channels is responsible for which part of the action potential? Group of answer choices Repolarization of the membrane Depolarization of the membrane Contraction of the post synaptic muscle fibre Signaling vesicular release of neurotransmitters
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