An all-or-none response to a threshold stimulus is characteristic of
A)individual muscle fibers.
B)small muscles.
C)large muscles.
D)none of these choices are correct

Question

Quizplus · Accepted Answer

An all-or-none response to a threshold stimulus is characteristic of individual muscle fibers, meaning that once stimulated to contract, the fibers will contract fully, with no partial contractions. This is because the threshold stimulus needed to activate the muscle fiber has been reached, and any further increase in stimulus intensity will not produce a stronger contraction. This response is not dependent on muscle size.

An All-Or-None Response to a Threshold Stimulus Is Characteristic of