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.
Frequently asked questions
What is the correct answer to this question?
For greater need of energy and oxygen
Why is this the correct answer?
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.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Control and Coordination.
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