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An Experiment about...Your Heart and Circulatory System!
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Think it
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There are about 5 liters of blood constantly circulating through your body due to the pumping action of your heart. Blood is transported throughout your entire body in blood vessels, like arteries and veins, of different sizes. The circulation of blood and the way it provides oxygen to your body is what makes up the circulatory system.
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Materials: Open space for exercise; pencil and paper
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Try it
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1. Sitting quietly, find your pulse with the fingers of your right hand on the underside of your left wrist. (or on the side of your neck, the vessels of your foot, or your temples.)
Why do you think you can feel your pulse in so many different places?
2. Count how many times your pulse beats in 30 seconds. Write the number down.
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3. Now, do a few jumping jacks.
4. Immediately check your pulse again and write down the number of times it is now beating in 30 seconds
5. Was your pulse rate different when you checked it the second time? Can you explain this?
6. Quietly check your pulse a few more times. How long does it take for the pulse rate to return to what it was when you started the experiment?
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Explorit
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