Question

A motor unit is best described as -

• A. All the nerve fibres and muscle fibres in a single muscle bundle
• B. One muscle fibre and its single nerve fibre
• C. A single motor neuron and all the muscle fibres that it innervates
• D. It is the neuron which carries the message from muscle to CNS

Answer 1

The correct option is C A single motor neuron and all the muscle fibres that it innervates

A motor unit is made up of a motor neuron and the skeletal muscle fibers innervated by that motor neuron axonal terminals, groups of motor units often work together to coordinate the contractions of a single muscle.

So, the correct option is 'A single motor neuron and all the muscle fibres that it innervates'