Multiple choice

ATP is required in the

  1. establishment of the resting potential

  2. initiation of the nerve impulse

  3. repolarization of the neural membrane

  4. depolarization of the neural membrane
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A Correct answer
Explanation

The Na+/K+ ATPase pump actively transports 3 Na+ out and 2 K+ in against their concentration gradients, using ATP to establish the resting membrane potential (~-70mV). Depolarization and repolarization are passive ion flows down gradients once the resting potential is established.

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