Approximately how much blood does an average adult have?

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Multiple Choice

Approximately how much blood does an average adult have?

Explanation:
Blood volume in an average adult is about five liters, which is roughly 7–8% of body weight. For a typical 70 kg person, that’s around 4.9 liters, so 4–5 liters is the best practical estimate. This amount supports circulating oxygen and nutrients to tissues and fits the common clinical rule of thumb used in exams. The other numbers aren’t representative: one liter is far too little to circulate through the body; two to three liters would be below average; six to seven liters would be higher than usual for a healthy adult.

Blood volume in an average adult is about five liters, which is roughly 7–8% of body weight. For a typical 70 kg person, that’s around 4.9 liters, so 4–5 liters is the best practical estimate. This amount supports circulating oxygen and nutrients to tissues and fits the common clinical rule of thumb used in exams. The other numbers aren’t representative: one liter is far too little to circulate through the body; two to three liters would be below average; six to seven liters would be higher than usual for a healthy adult.

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