What is the normal amount of blood in a human body?

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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

What is the normal amount of blood in a human body?

Explanation:
Total blood volume in an adult is about 4.5 to 6.0 liters, roughly 7–8% of body weight. This means a person of average size often has around 5 liters of blood, with 5.6 liters sitting comfortably inside the normal range. The other values are outside the typical range for most adults: 3.5 liters is low, 4.5 liters is possible but on the low end, and 7.0 liters would be high for many people. So 5.6 liters is the best estimate for a normal amount of blood in a typical adult.

Total blood volume in an adult is about 4.5 to 6.0 liters, roughly 7–8% of body weight. This means a person of average size often has around 5 liters of blood, with 5.6 liters sitting comfortably inside the normal range. The other values are outside the typical range for most adults: 3.5 liters is low, 4.5 liters is possible but on the low end, and 7.0 liters would be high for many people. So 5.6 liters is the best estimate for a normal amount of blood in a typical adult.

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