Approximately how many liters of blood are in an average adult human?

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Prepare for the PLTW Biomedical Science Test. Study with flashcards and multiple choice questions, each question comes with hints and explanations. Get ready for your exam!

Multiple Choice

Approximately how many liters of blood are in an average adult human?

Explanation:
Blood volume is about 7–8% of a person’s body weight. For a typical adult around 70 kg, that works out to roughly 5–6 liters of blood. Using the common estimate of about 0.08 of body weight gives 0.08 × 70 ≈ 5.6 liters, which fits well with everyday teaching that an average adult has about five liters of blood, with some variation. So 5.6 liters is a sensible approximate value for a standard adult. The smaller amounts would reflect smaller individuals or lower percentages, while a much larger amount like 7.5 liters would be unusually high for the average adult.

Blood volume is about 7–8% of a person’s body weight. For a typical adult around 70 kg, that works out to roughly 5–6 liters of blood. Using the common estimate of about 0.08 of body weight gives 0.08 × 70 ≈ 5.6 liters, which fits well with everyday teaching that an average adult has about five liters of blood, with some variation. So 5.6 liters is a sensible approximate value for a standard adult. The smaller amounts would reflect smaller individuals or lower percentages, while a much larger amount like 7.5 liters would be unusually high for the average adult.

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