BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Final answer: Contractile proteins are found in muscles.

Detailed explanation-2: -Muscular tissues are majorly responsible for the movement of our body. It is composed of contractile proteins which are made up of actin and myosin.

Detailed explanation-3: -Contractile proteins are widely distributed in nature and appear to be present not only in motor organs but in any living cell. They have recently been isolated from brain, liver, thyroid, pancreas, etc.

Detailed explanation-4: -A sarcomere is the basic contractile unit of muscle fiber. Each sarcomere is composed of two main protein filaments-actin and myosin-which are the active structures responsible for muscular contraction.

Detailed explanation-5: -The most important are the contractile proteins actin and myosin. Among the regulatory proteins, troponin, tropomyosin, M-protein, beta-actin, gamma-actin and C-protein are great importance.