Approximately how much blood does an average adult human body contain?

• A. About 5 liters (approximately 4.5–6.0 L)
• B. About 20 liters
• C. About 10 liters
• D. About 1 liter

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.
2. Recall that blood volume varies depending on factors such as body size, sex, and health, but there is a commonly accepted average range.
3. Recognize that the average adult human body contains approximately 4.5 to 6.0 liters of blood, which is roughly 7-8% of total body weight.
4. Compare the given options to this known range to identify the closest and most accurate estimate.
5. Conclude that the correct answer is about 5 liters, as it falls within the typical physiological range for blood volume in adults.