In a typical healthy adult, approximately how many gallons of blood are in the human body?

• A. About 5.0 gallons
• B. About 3.0 gallons
• C. About 0.5 gallons
• D. About 1.5 gallons

Answer: (D)

Verified step by step guidance

1. Understand that the average volume of blood in a typical healthy adult is generally estimated based on body weight and physiological norms.
2. Recall that blood volume is often approximated as about 7-8% of total body weight in kilograms.
3. Convert this blood volume from liters to gallons, knowing that 1 gallon is approximately 3.785 liters.
4. Compare the calculated volume in gallons to the given options to identify the closest estimate.
5. Recognize that the commonly accepted average blood volume in adults is about 1.5 gallons, which aligns with physiological data.