Muscles use oxygen to create the fuel needed for the work involved in exercise. Your muscles need more fuel when you exercise, and that's why your heart rate, or pulse, increases. After exercise, your heart rate returns to its normal or resting rate fairly quickly.
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HEART RATE
- The heart rate increases to supply the muscles with more oxygen to produce extra energy.
- The heart can beat up to 200 times per minute with extreme exercise.
- The brain sends nerve signals to the heart to control the rate.
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Answer:
Muscles use oxygen to create the fuel needed for the work involved in exercise. Your muscles need more fuel when you exercise, and that's why your heart rate, or pulse, increases. After exercise, your heart rate returns to its normal or resting rate fairly quickly.
Explanation: