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Why does a runner need more blood in muscles just after starting a race?

Answer and explanation

Correct answer: For greater need of energy and oxygen

During running, skeletal muscles contract more frequently and perform greater work than they do at rest. Their cells therefore need increased oxygen and glucose for aerobic respiration, which releases ATP for muscle contraction. Blood delivers these materials and removes carbon dioxide and other wastes. Hence option A is correct. The other options do not explain the increased circulation to active muscles.

Related tags

MusclesOxygen SupplyRespirationRunningControl And CoordinationWorld Of LivingScienceClass 10 Mcq

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