What happens during vigorous exercising?

Rate of metabolism increases

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Need of oxygen increases

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Both A and B

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None of the above

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Solution

The correct option is B Both A and B
During vigorous exercise, breathing rate increases due to the high rate of metabolism. The increased metabolic rate needs a huge amount of oxygen, which can be provided by increasing the rate of respiration.
Therefore, the correct answer is option C.

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Similar questions

Give scientific reasons.

(1) Breathing rate increases during vigorous exercising.

(2) Translocation is needed in all higher plants.

(3) The plants are kept in dark before determining the factors essential for photosynthesis.

(4) It is necessary to separate oxygenated blood from the deoxygenated blood in mammals.

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