Why a person's heart rate speeds up when he/she is doing a strenuous exercise like running?
A. The heart stops pumping blood at this time.
B. More exygen is needed in the body.
C. Less oxygen is needed in the body.
D. More carbon dioxide is needed.
A. The heart stops pumping blood at this time.
B. More exygen is needed in the body.
C. Less oxygen is needed in the body.
D. More carbon dioxide is needed.
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Answer:
B. More exygen is needed in the body.
Explanation:
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