Answer:
The correct option is A. a motor unit consists of one nerve and all the skeletal muscles it innervates.
Explanation:
Motor units are involved in functions like controlling the muscle contractions in an organism. A motor unit comprises of a motor nerve which innervates with a number of muscle fibers. For example, in the temporalis muscle, a motor nerve innervates with 1000 fibers.
A number of motor units might work up together in the form of a group to provide contractions to a single muscle. The type of fiber for all the units is same.
