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

• A. About 1 liter (≈2 pints)
• B. About 15 liters (≈32 pints)
• C. About 25 liters (≈53 pints)
• D. About 5 liters (≈10–12 pints)

Answer: (D)

Verified step by step guidance

1. Understand that the question asks for the approximate volume of blood in an average adult human body, which is a typical physiological fact rather than a calculation problem.
2. Recall that the average adult human body contains a certain volume of blood that circulates through the cardiovascular system, supplying oxygen and nutrients to tissues.
3. Recognize that the typical volume of blood in an adult is often cited in anatomy and physiology textbooks as approximately 5 liters, which is equivalent to about 10 to 12 pints.
4. Compare the given options with this known physiological fact to identify the correct approximate volume of blood.
5. Conclude that the correct answer is the option stating about 5 liters (≈10–12 pints), as it aligns with standard human anatomy and physiology knowledge.