The immediate source of energy is _________ for muscle contraction.

glycogen

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lactic acid

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phosphocreatine

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ATP

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Solution

The correct option is D ATP
ATP is needed for the events involved in muscle contraction. The immediate source of energy for muscle contraction is the ATP present in the muscle fibres. But it is not enough to sustain muscle contraction, so the ATP is produced in the muscle in 3 ways- 1. from creatine phosphate 2. Glycolysis which is anaerobic cellular respiration and 3. By aerobic cellular respiration through Krebs cycle.

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The only immediate source of energy for muscular contraction is

Read the following statements about muscle contraction in humans:

i. Chemical energy is converted into mechanical energy during muscle contraction

ii. Acetylcholineeasterase is an enzyme that catalyzes the production of acetylcholine

iii. In a contracted muscle, volume remains the same.

iv. A contracted muscle becomes shorter and thicker.

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