A motor unit consists of
A. a single motor neuron and the multiple muscle fibers it controls.
B. multiple motor neurons and multiple muscle fibers.
C. an end plate, a T-tubule, and sarcoplasmic reticulum.
D. multiple motor neurons and the one muscle fiber they control.
E. one synaptic terminal button, a cleft, and an acetylcholine receptor.
Answer: A
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