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each type of blood vessel has a different job

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The circulatory system works 24 hours a day seven days a week

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about 8 million blood cells die in the human body

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your heart is your largest muscle in
your body and it pumps oxygen

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your heart is a mucle

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at rest an adults heart pumps about 11 pints (5 liters) of blood each min during exercise that rate can rise to as high as 70 pints (35 liters) a min.

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your heart is a muscle

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White blood cells are the body´s defense  system

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The left side of the heart is bigger than the right because it does more work.

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The heart beats 3 billion times

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a adult human

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it takes a minute for your blood to go every where in your body

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The circulatory system works while your sleeping

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your heart contains oxygen

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It takes a minute to circulate blood everyday.

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you can lose as much as 25 percent of your blood and still survive

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The left side of the heart is bigger than the right side because it does more work.

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Your blood makes one round trip after another within this closed trip

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the liquid part of your blood isn't red it is a colorless fluid called plasma

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you could loose 29 percent of your blood and still survive

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hearts pumps blood around the body.

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The heart is the largest muscle