Question

question 5 (1.7 points)
which of the following would be recruited later in muscle stimulation when contractile strength increases?
a) motor units with larger, less excitable neurons
b) motor units with the longest muscle fibers
c) large motor units with small, highly excitable neurons
d) many small motor units with the ability to stimulate other motor units

Explanation:

Motor units with larger, less excitable neurons are recruited later. This is based on the size - principle of motor unit recruitment. Smaller, more excitable motor units are recruited first for low - level contractions. As the force requirement (contractile strength) increases, larger motor units with less excitable neurons (higher threshold) are recruited.

Answer:

A. motor units with larger, less excitable neurons