Which of the following muscles most likely contains motor units that are relatively small (motor neurons that innervate only a small number of muscle fibers each)?
A) the biceps femoris.
B) the trapezius.
C) the intrinsic hand muscles.
D) the latissimus dorsi
E) the sternocleidomastoid.

Question

Quizplus · Accepted Answer

The intrinsic hand muscles are responsible for fine motor control and precise movements, such as typing or playing an instrument. Therefore, they require small motor units with fewer muscle fibers innervated by each motor neuron.

Which of the Following Muscles Most Likely Contains Motor Units