A whole muscle can produce graded increases in force main...

A whole muscle can produce graded increases in force mainly by:

medium

AMaking individual muscle fibers produce bigger action potentials

Recruiting more motor units and increasing firing frequency (summation)

CChanging the length of actin filaments permanently

DSwitching from troponin to calmodulin

ELetting tendons contract independently

Explanation

A single fiber's action potential is all-or-none, so force is graded by recruiting more fibers (motor units) and by higher stimulation frequency (temporal summation/tetanus).

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Back to Deck — Muscle Contraction, Muscle Tissue & Tendons

Source: entermedschool.org

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