Muscles used for delicate,finely controlled movements have smaller motor units than more coarsely controlled muscles.

Question

Quizplus · Accepted Answer

This statement is true. Motor units are made up of a motor neuron and the group of muscle fibers it innervates. Muscles used for delicate and finely controlled movements, such as those in the fingers, require small and precise movements. Therefore, they have smaller motor units with fewer muscle fibers for each motor neuron to control. In contrast, muscles used for more coarse movements, such as those in the legs, have larger motor units with more muscle fibers for each motor neuron to control.

Muscles Used for Delicate,finely Controlled Movements Have Smaller Motor Units