A motor unit consists of

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


B

Anatomy & Physiology

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