Question

Muscle A and muscle B are the same size, but muscle A is capable of much finer control than muscle 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 fewer neurons than muscle B

Answer 1

The correct option is C It is controlled by more neurons than muscle B

Muscle A is controlled by the more neurons than muscle B.
Fine motor control is accomplished by the presence of smaller, more numerous motor units. Therefore, muscle A having numerous motor units, is able to control much finer motor movements.