Explanation

• approximately 7–8% of an adult’s body weight
• approximately 8–9% of a child’s body weight
• approximately 9–10% of an infant’s body weight

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• Scientists estimate the volume of blood in a human to be approximately 7 per cent of body weight.
• An average adult with a weight of 150 to 180 pounds
• will contain approximately 1.2 to 1.5 gallons (4.7 to 5.5 litres) of blood.