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Membrane depolarization

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If an inhibitor of acetylcholinesterase is added to a neuromuscular junction, then the postsynaptic membrane will:

A) be depolarized by action potentials more frequently
B) be depolarized longer with each action potential
C) be resistant to depolarization
D) spontaneously depolarize

Can anyone help me differentiate between A and B? I chose A but the TPR book says B is the correct answer. Wouldn't more depolarization = higher frequency of action potentials?

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