A) actin and myosin make actomyosin
B) phosphate reserve comes from CPK
C) chemical energy is converted into mechanical energy
D) mechanical energy is converted into chemical energy.
Correct Answer: D
Solution :
: Muscle cells have a contractile mechanism which is activated by the action potential. The action potential is transmitted along the muscle fibre and initiates the contractile response. The contractile proteins are actin and myosin. Actin and myosine get combined in presence of ATP and\[C{{a}^{2+}}\]to form actomyosin to provide contraction in muscle. Muscle contraction require energy, and muscle has been called a machine for converting chemical energy into mechanical work. The immediate source of this energy is energy rich organic phosphate derivatives in muscle. The ultimate source is the intermediary metabolism of carbohydrates and lipids. The hydrolysis of ATP is to provide the energy for contraction. ATP is resynthesized from ADP by addition of a phosphate group. In muscle there also exists another energy rich phosphate compound that can supply this energy for short periods. This compound is phosphoryl creatine which is hydrolysed to creatine and phosphate groups with release of considerable energy.
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