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During the DEPOLARIZATION phase of an action potential, the membrane potential rises because:
AK+ ions rapidly flow out of the cell
BNa+ ions rapidly flow INTO the cell
CCl- ions move into the cell
DBoth Na+ and K+ flow out together
Answer & Solution
Correct answer: B. Na+ ions rapidly flow INTO the cell
DEPOLARIZATION: voltage-gated Na+ channels open; Na+ rushes IN (down concentration + electrical gradient), making inside positive (up to +30 mV). Repolarization: K+ channels open, K+ flows OUT, restoring negative inside.
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