The strength or weakness of a muscle contraction depends on the number of motor units activated and the frequency at which they are firing. An increase in either of these two factors allows for graded contractions through the process of

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Summation allows for graded contractions by increasing the frequency of muscle fiber stimulation through repeated motor unit activation. This leads to increased calcium release and higher force production in the muscle fibers.

The Strength or Weakness of a Muscle Contraction Depends on the Number