Question: During an action potential, (a) the membrane potential becomes more negative until it hits threshold. (b) the membrane potential increases as potassium ions flow out.

During an action potential,

(a) the membrane potential becomes more negative until it hits threshold.

(b) the membrane potential increases as potassium ions flow out.

(c) the membrane potential increases as sodium ions flow in and then decreases as potassium ions flow out.

(d) the membrane potential may or may not reach threshold.

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