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D euild Dingala QUESTION 53 Heart rate increases during exercise because O A. your muscles need more oxygen O B. cells need o
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Answer #1

During exercise, the body muscles increases their activity and utilize high amount of oxygen, so the heart rate increases to fulfill the demand of oxygen of the muscle. So, options A and B both are correct. Because muscle need more oxygen during exercise and the cells need oxygen for aerobic cellular respiration.

Hence, option D is correct

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