Anatomy And Physiology – Muscular System Practice Test

What method does muscle fiber contraction follow?

Contractions proportional to stimulus intensity Contractions are random All-or-none principle states fibers contract completely or not at all Contractions are graded by stimulus frequency

Correct Answer:

All-or-none principle states fibers contract completely or not at all

Explanation:

Muscle fiber contraction follows an all-or-none response. Once a threshold stimulus triggers an action potential, the fiber contracts to its maximal tension for that fiber; if the stimulus is below threshold, it remains relaxed. This is why the body grades force not by making a single fiber contract more strongly in response to stronger stimuli, but by recruiting more fibers (motor units) and by adjusting firing frequency across activated fibers.

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