In a contracted muscle, the A bands do narrow because the length of the myosin myofilaments changes,.

Name: In a contracted muscle, the A bands do narrow because the length of the myosin myofilaments changes,.
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The A bands do not narrow during muscle contraction because the length of the myosin myofilaments remains constant; instead, the I bands and H zones narrow as actin and myosin filaments slide past each other.

In a Contracted Muscle, the a Bands Do Narrow Because