The contractile protein of skeletal muscle involving ATP ase activity is (a) troponin (b) tropomyosin (c)...

The contractile protein of skeletal muscle involving ATP ase activity is

(a) troponin

(b) tropomyosin

(c) myosin

(d) a-actinin

Expert Solution

Option c that is myosin is the correct answer. The myofibril (contractile unit) of skeletal muscle is composed of three types of proteins. 1. Contractile 2. regulatory and 3. structural.

There are two types of contractile proteins. 1. Actin and 2. Myosin. The contractile proteins are responsible for contraction of skeletal muscles.

There are two types of regulatory proteins. 1. Troponin and 2. tropomysium. The regulatory proteins are responsible for turning muscle contraction "on or off".

Structural protreins are responsible for the stability and elasticity of the myofibril.

The myosin protein is further classified as motor protein because it produces force or movements by using the chemical energy stored in the form of ATP. The myosin cross bridge has the site for binding actin and ATP molecule. The ATP molecule bounded with myosin degraded with the help of ATPase enzyme and converts into ADP and Pi. The ADP is further converted into AMP and Pi with the release of energy. This released energy is used by the myosin filament to create force of contraction.

Thus, the correct answer is myosin.

gladiator answered 2 years ago

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