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English, 06.01.2021 22:40 Rileyb101207

Your heart normally beats 70 to 80 times a minute, but the rate changes depending on your activity level. When you exercise, your body needs more oxygen than when you remain still. Your heart automatically responds to these changing needs. When you need more oxygen, your heart beats faster to increase the flow of blood to your body. Which of the following best summarizes the passage above?

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