Which Event Would Make It Less Likely for a Postsynaptic

question 50

Multiple Choice

Which event would make it less likely for a postsynaptic muscle cell to fire an action potential?

• A) Failure of Ca²⁺ to trigger exocytosis in the axon terminal of the presynaptic motor neuron
• B) Inhibition of acetylcholinesterase in the synaptic cleft
• C) Opening of voltage-gated Na⁺ channels and entrance of Na⁺ into the cell
• D) Binding of acetylcholine to its receptors in the motor end plate
• E) An increase in excitatory inputs

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