Human body mai kitna blood hona chahiye
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Scientists believe that for a healthy person blood should be 7% of the human body weight and it ranges between 4.7 to 5.5 litres.
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The amount is depending on Gender and weight. Women normally have 65 (+- 10) ml per kg, men 77 (+- 10) ml per kg bodyweight. This means, a woman with 55 kg has 3–4 liters, a man with 75 kg has 5–6.5 liters of blood. Kids have more per kg, but it decreases with aging, being on the adult level in the later teenager years.
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