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Unlike a voluntary contraction, electrical stimulation recruits _____ fibers first.

a. Small
b. Medium
c. Large
d. A-delta

1 Answer

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Final answer:

Electrical stimulation recruits smaller fibers first, controlled by smaller motor units and lower-threshold motor neurons. Larger motor units are recruited for more strength.

Step-by-step explanation:

The electrical stimulation of muscles recruits smaller fibers first. These smaller fibers belong to small motor units in the muscle, which are controlled by smaller, lower-threshold motor neurons. As more strength is required, larger motor units with bigger, higher-threshold motor neurons are recruited, activating larger muscle fibers.

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