In order to stimulate a muscle contraction, a motor neuron must release a neurotransmitter at the neuromuscular junction

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In order to stimulate a muscle contraction, a motorneuron must release a neurotransmitter at the neuromuscularjunction. Where is this chemical released?
A) throughout the muscle fiber
B) directly onto the motor end plate
C) into the synaptic cleft
D) into the cytoplasm of the muscle cell