Answer:
one motor neuron and the group of muscle fibers it innervates.
Explanation:
The concept of motor unit was given by Charles Scoot. A motor unit work together in a group and result in the coordination of a single muscle.
A motor unit is made upof a motor neuron and the skeletal muscle fibers that innervates the motor neuron. The motor unit consists of same muscle fibers.
Hence, the correct answer is option (b).
