myosin

[ mahy-uh-sin ]

Phonetic (Standard)IPA

noun

, Biochemistry.

myosin

/ ˈmaɪəsɪn /

the chief protein of muscle that interacts with actin to form actomyosin during muscle contraction; it is also present in many other cell types

myosin

/ mī′ə-sĭn /

A protein found in muscle tissue as a thick filament made up of an aggregate of similar proteins. Myosin and the protein actin form the contractile units (sarcomeres) of skeletal muscle. In the sarcomere, actin and myosin filaments slide past each other to cause the shortening of a muscle fiber.

Origin of myosin¹

First recorded in 1865–70; my- + -ose ² + -in ²

Origin of myosin¹

C19: from myo- + -ose ² + -in

The pemmican we used consisted of powdered dried beef (containing the important protein, myosin) and 50 per cent.

Into this special class fall myosin (of the muscles), fibrinogen (of the blood) and vitellin (of egg yolk).

Other forms of protein are globulin and myosin, which form the actual muscle-substance.

Another similar experiment made with antipeptone, formed from the myosin of muscle-tissue, gave like results.

April 23, 2024inveterate

[in-vet-er-it ]

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