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  4. Which of the following is the contractile protein of a muscle?

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Q. Which of the following is the contractile protein of a muscle?

AIPMTAIPMT 1998Locomotion and Movement

Solution:

Myosin is a contractile protein of muscle. Primary myofilaments are made up of this protein. Each myosin filament is a polymerised protein made of many monomeric protein called meromyosins. Secondary myofilaments are composed of a protein actin, having with it two regulatory proteins : tropomyosin and troponin. Myosin interacts with actin to bring about contraction of muscle or cell movement. Tubulin is a protein of which the microtubules of cells are formed.