Why does depolarization occur? Multiple Choice More K+K+ diffuse into the cell than Na+Na+ diffuse out of it. More K+K+ diffuse out of the cell than Na+Na+ diffuse into it. More Na+Na+ diffuse into the cell than K+K+ diffuse out of it. More Na+Na+ diffuse out of the cell than K+K+ diffuse into it. Both Na+Na+ and K+K+ diffuse into the cell.
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23. During an action potential, the inside of the cell membrane becomes more positive than the outside. Why does this happen? A. During depolarization, the potassium ions rush in and the sodium ions have begun rushing out, making the inside more positive. B. During depolarization, the sodium ions rush in and the potassium ions have begun rushing out, making the outside more positive. C. During depolarization, the sodium ions rush in and the potassium ions have not begun rushing out, making the outside more positive. D. During depolarization, the sodium ions rush in and the potassium ions have not begun rushing out, making the inside more positive.
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What happens when a resting neuron's membrane depolarizes? (A) There is a net diffusion of Na $^{+}$ out of the cell. (B) The equilibrium potential for $\mathrm{K}^{+}\left(E_{\mathrm{k}}\right)$ becomes more positive. (C) The neuron's membrane voltage becomes more positive. (D) The cell's inside becomes more negative than the outside.
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What ion depolarizes the membrane when it diffuses into the axon of a neuron?
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