Choose the correct statement regarding motor units.
A) Muscle fibers of each motor unit are not mingled with those of other motor units.
B) During a sustained contraction, all motor units are activated simultaneously.
C) A motor neuron may control only two or three muscle fibers of the eye muscle(s).
D) When muscles contract for sustained periods, maximal tension is maintained.
E) Most motor neurons control fewer than five muscle fibers.

Question

Quizplus · Accepted Answer

Option C is correct as it is a true statement about motor units. A single motor neuron of the eye muscle(s) may control only two or three muscle fibers. Hence, in order to produce a greater force of contraction, more motor units have to be stimulated to contract. Options A, B, D, and E are incorrect statements about motor units.

Choose the Correct Statement Regarding Motor Units