Immediate source of energy for muscle contraction is
Correct answer: C. ATP
- A. Glucose
- B. GTP
- C. ATP
- D. Creatine phosphate
Explanation
ATP is the immediate source of energy for muscle contraction. When ATP is hydrolyzed to ADP (adenosine diphosphate) and inorganic phosphate (Pi), energy is released and used to power muscle contractions. This process is rapid and occurs within the muscle cells themselves, providing the necessary energy for immediate muscle activity.
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About Muscle Contraction
Muscle contraction is explained by the sliding filament model, in which myosin heads pull actin filaments within sarcomeres using ATP. The topic covers calcium, troponin, tropomyosin, the neuromuscular junction and relaxation, with attention to how filament length stays almost constant while the sarcomere shortens.
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