A motor unit is made up of:
Correct answer: B. A motor neuron and the muscle fibers it innervates
- A. All the muscle fibers within a given muscle
- B. A motor neuron and the muscle fibers it innervates
- C. All the neurons going into an individual section of a body
- D. A fascicle and a nerve
Explanation
A motor unit is indeed composed of a motor neuron and all the muscle fibers it innervates (connects to). When the motor neuron sends an electrical signal (action potential), all the muscle fibers within that motor unit contract simultaneously. Motor units vary in size and can include a few to many muscle fibers, depending on the precision and strength required for the muscle's function.
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