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Myosin is a protein in a muscle fiber that, with actin, is responsible for contraction and relaxation. These proteins comprise about 65% of total muscle protein.

Myosin molecules make up the thick A-band of the muscle sarcomere and are comprised of long chains with numerous tails coming off them. Each tail of the myosin filaments has a head which is able to attach to a binding site on an actin molecule.

Myofilament diagram of muscle cell showing actin and myosin

This page created 17 Sep 2011 22:16
Last updated 02 Mar 2016 20:18

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