1. What happens to your heartbeat after you perform some exercises?
2. Why does your heart beat faster when you are doing some strenuous work than when you are resting?
3. Why do you think your pulse changes when you exercise?
4. Try to squeeze or press the tip of your fingers in your right hand using your left hand. Observe the color of the skin in your fingers. What makes the skin red?
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Answer:
1.your heart typically beats faster 2.When you are exercising, your muscles need extra oxygen 3.heart typically beats faster so that more blood gets out to your body. 4. because your pushing the blood.
Explanation:
Answer:
I'm gonna answer number 4 in the comments because I'm still thinking about the answer.