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Physiology Test Question
Arrival of an action potential at the axon terminal of a motor neuron causes the fusion of acetylcholine-containing synaptic vesicles with the pre-synaptic plasma membrane of the axon terminal. Acetylcholine then diffuses across the synaptic cleft to bind to and activate nicotinic acetylcholine receptors. Activation of the nicotinic acetylcholine receptors leads to an initial depolarization before a skeletal muscle action potential is initiated. The initial depolarization of the skeletal muscle plasma membrane at the neuromuscular junction (NMJ) is referred to as the:



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Posted: Sunday, September 14, 2014