| Amazing Facts about the |
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| Circulatory System |
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| The
heart beats around 3 billion times in the averages person's life. |
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| About
8 million blood cells die in the human body every second, |
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the same number are born each second. |
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| Within
a tiny droplet of blood, there are some 5 million red blood cells. |
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| It
takes about 20 seconds for a red blood cell to circle the whole body. |
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| Red
blood cells make approximately 250,000 round trips of the body before |
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| returning
to the bone marrow, where they were born, to die. |
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| Red
blood cells may live for about 4 months circulating throughout the body, |
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| feeding
the 60 trillion other body cells. |
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