BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Muscle contraction thus results from an interaction between the actin and myosin filaments that generates their movement relative to one another. The molecular basis for this interaction is the binding of myosin to actin filaments, allowing myosin to function as a motor that drives filament sliding.

Detailed explanation-2: -Contractile proteins are involved in contraction and relaxation of skeletal muscles. Myosin and actin are the contractile proteins. The myosin filament or the thick filament is made of heavy meromyosin and light meromyosin. The actin filament or the thin filament is made of F-actin, troponin, and tropomyosin.

Detailed explanation-3: -The actin–myosin interaction produces two types of movements: force generation between actin filaments leading to contractions, such as in muscle contraction, cell motility, and cytokinesis; and transport of subcellular organelles and macromolecular complexes by myosin motors along actin filaments.

Detailed explanation-4: -Skeletal muscles are long and cylindrical in appearance; when viewed under a microscope, skeletal muscle tissue has a striped or striated appearance. The striations are caused by the regular arrangement of contractile proteins (actin and myosin).

Detailed explanation-5: -Within the sarcomere, myosin slides along actin to contract the muscle fiber in a process that requires ATP. Scientists have also identified many of the molecules involved in regulating muscle contractions and motor behaviors, including calcium, troponin, and tropomyosin.