Question

a skeletal muscle will typically only contract when stimulated by its motor neuron at the

neuromuscular junction
myofibril junction
sarcoplasmic junction

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Explanation:

Skeletal muscles contract when motor neurons release neurotransmitters at the neuromuscular junction, which is the synapse between the motor neuron and the muscle fiber. There are no such things as myofibril junction or sarcoplasmic junction in this context.

Answer:

A. neuromuscular junction