In a typical healthy adult human, approximately how much total blood volume is present in the body?

• A. About 20 liters (approximately 18–22 L)
• B. About 5 liters (approximately 4–6 L)
• C. About 1 liter (approximately 0.5–1.5 L)
• D. About 10 liters (approximately 9–11 L)

Answer: (B)

Verified step by step guidance

1. Understand that the total blood volume in a typical healthy adult human is the amount of blood circulating within the entire cardiovascular system, including the heart, arteries, veins, and capillaries.
2. Recall that blood volume is generally proportional to body size and weight, but for an average adult, it falls within a standard range.
3. Recognize that the commonly accepted average blood volume for a healthy adult is approximately 5 liters, with a normal range between 4 to 6 liters.
4. Compare the given options to this known physiological range to identify which value aligns best with typical human blood volume.
5. Conclude that the correct answer is the option closest to 5 liters, as it matches the established average blood volume in healthy adults.