Question

why does the heart rate change while we are resting and during exercise? ​

Answer 1

Answer:

Your heart is continuously beating to keep blood circulating throughout your body. Its rate changes depending on your activity level; it is lower while you are asleep and at rest and higher while you exercise—to supply your muscles with enough freshly oxygenated blood to keep the functioning at a high level. ..

Explanation:

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Answer 2

Explanation:

this is your answers in the photo