Question

Muscle A and muscle B are the same size, but muscle A is capable of much finer control than muscle B. Which B. Which one of the following is likely to be true of muscle A?

• A. It contains fewer motor units than muscle B.
• B. It has larger sarcomeres than muscle B.
• C. It is controlled by more neurons than muscle B.
• D. It is controlled by ewer neurons than muscle B.

Answer 1

The correct option is A It contains fewer motor units than muscle B.

Nerve cells called motor neurons controls skeletal muscles. Each motor neuron controls a group of cell called motor units. When it receives a signal from the brain, it stimulates all of the muscle cells in its motor unit at the same time.

So, option A is the correct option.