How much blood is in the human body?

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It depends on how big you are... and on where you live. If you weigh about 36 kilograms , you have about 2 1/3 liters of blood in your body. Someone double your weight has twice as much blood.

At high elevations, such as at mountain tops, there is less oxygen in the air than at ground level. Your body then must manufacture more blood to capture and circulate the extra oxygen that the body needs to function and develop.