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

Name: In a contracted muscle, the A bands narrow because the length of the myosin myofilaments changes.
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In a contracted muscle, the A bands do not narrow; they remain the same length because the length of the myosin myofilaments does not change. It is the I bands that narrow as the actin myofilaments slide over the myosin, shortening the sarcomere.

In a Contracted Muscle, the a Bands Narrow Because the Length