Question

Which of the following statements is incorrect about motor units?

a. Some motor neurons stimulate only a few dozen muscle fibers.
b. Some motor neurons stimulate a few thousand muscle fibers.
c. The more muscle fibers stimulated by a motor neuron, the more precise the movements of that muscle can be.
d. All of the above statements are correct about motor units

Answer 1

The size of motor units can vary and is not directly related to the precision of movements. The fewer muscle fibers stimulated by a motor neuron, the more precise the movements of that muscle can be.

Step-by-step explanation:

Motor units consist of a motor neuron and the muscle fibers it controls. The size of motor units can vary, with some containing only a few dozen muscle fibers and others containing a few thousand. The statement that is incorrect about motor units is c. The more muscle fibers stimulated by a motor neuron, the more precise the movements of that muscle can be. In reality, the opposite is true: the fewer muscle fibers stimulated by a motor neuron, the more precise the movements of that muscle can be.