The average adult has a blood volume of about __________ liters.
Correct answer: B. 5
- A. 4
- B. 5
- C. 6
- D. 7
Explanation
A typical adult breathes about 5 to 8 litres of air per minute at rest, which totals roughly 7,000 to 12,000 litres per day. Therefore, 5 litres is the closest standard estimate among the options.
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