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Locomotion and Movement — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYLocomotion and Movement3 Marks
Question
What is the source of energy for muscle contraction?
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Answer

ATP is the source of energy for muscle contraction. The head of each myosin molecule contains an enzyme, myosin ATPase. In the presence of ATPase, $Ca ^{2+}, Mg ^{2+}$ ions, ATP breaks down into ADP and inorganic phosphate, releasing energy in the head of myosin. Energy from ATP causes energized myosin cross bridges to bind to actin. The energised cross-bridges move, causing thin myofilaments to slide along the thick myofilaments, thus initiating muscle contraction.

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