Approximately how much blood is present in the average adult human body?

• A. About 5 liters (approximately 4–6 L)
• B. About 50 liters (approximately 45–55 L)
• C. About 0.5 liters (approximately 0.4–0.6 L)
• D. About 15 liters (approximately 14–16 L)

Answer: (A)

Verified step by step guidance

1. Understand that the question is asking for the typical volume of blood in an average adult human body, which is a standard physiological fact rather than a calculation problem.
2. Recall that the average adult human body contains a certain volume of blood that supports vital functions such as oxygen transport, nutrient delivery, and waste removal.
3. Recognize that the typical range for blood volume in adults is generally between 4 to 6 liters, depending on factors like body size and sex.
4. Compare the given options to this known physiological range to identify the most accurate estimate.
5. Select the option that falls within the normal range of approximately 4 to 6 liters, which is about 5 liters of blood in the average adult human body.