Fill in the blank with options listed: At the very peak of an action potential,

Question

Fill in the blank with options listed:

At the very peak of an action potential, the overall driving force acting on sodium ions is _________ (much stronger than, much weaker than, or about the same magnitude as) the overall driving force acting on potassium ions.

During the steep rising phase of an action potential, the membrane permeability to sodium ions is _________ (much higher than, much lower than, or about the same as) the membrane permeability to potassium ions.

During the undershoot of an action potential, while Vm is still decreasing, potassium ion conductance is _________ (greater, lesser, or about the same) through delayed rectifier K channels as compared to leaky K channels.

Explanation / Answer

At the very peak of an action potential, the overall driving force acting on sodium ions is much stronger than the overall diving force acting on potassium ions.

During the steep rising phase of an action potential, the membrane permeability to sodium ions is Much Higher than(much higher than, much lower than, or about the same as) the membrane permeability to potassium ions.

During the undershoot of an action potential, while Vm is still decreasing, potassium ion conductance is greater (greater, lesser, or about the same) through delayed rectifier K channels as compared to leaky K channels.

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