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Human Blood

A buffer of carbonic acid (H2CO3) and bicarbonate (HCO3-) is present in the human blood stream, in order to maintain a pH between 7.35 and 7.45. Blood accounts for ~8% of body mass. Adult humans have ~60 millilitres of blood per kilogram of body weight. This amounts to ~4-5 litres (roughly a gallon) of blood in an adult.

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These fast facts were based off of a Wikipedia Document on Body Parts.

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