01 DEFINITION Functional classification of body muscle The skeletal muscles are of following types: Flexor Extensor Abductor Adductor Pronator Elevator Supinator Depressor Rotator Sphincter Dilator 02 DEFINITION Thin myofilament It is composed of three proteins. They are Actin Tropomyosin Troponin 03 DEFINITION Thick myofilaments Thick myofilaments are formed by myosin protein. Myosin molecule is made up of six polypeptide chains, two identical heavy chains and four light chains. Myosin is spilt by enzyme trypsin into two fragments called light meromyosin and heavy meromyosin. 04 DEFINITION Role of biomolecules for muscle contraction Muscle proteins such as myosin, actin play a significant role during muscle contraction. Carbohydrate and lipids are stored as food and supply high energy. Enzymes catalyze all biological reactions that are involved in muscular contraction....
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