Which of the following would be recruited later in muscle stimulation when contractile strength increases?
A) motor units with the longest muscle fibers
B) large motor units with small, highly excitable neurons
C) many small motor units with the ability to stimulate other motor units
D) motor units with larger, less excitable neurons

Question

Quizplus · Accepted Answer

Motor units with larger, less excitable neurons are typically recruited later in muscle stimulation as contractile strength increases. This is due to the size principle, where smaller motor units are recruited first for fine motor control, and larger motor units are recruited as more force is needed.

Which of the Following Would Be Recruited Later in Muscle