Define motor Unit

Multiple Choice

Define motor unit.

A) A motor unit is the sum total of all the motor neurons going to a specific muscle.
B) A motor unit is the sum total of all the muscle fibers in a whole muscle.
C) A motor unit is the maximum tension that a whole muscle can generate with maximum stimulation.
D) A motor unit is a motor neuron and all the muscle fibers that it controls.
E) A motor unit is the sensory neuron going away from and the motor neuron going to a skeletal muscle.