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

• A. About 5 gallons (≈19 liters)
• B. About 3 gallons (≈11–12 liters)
• C. About 0.5 gallons (≈2 liters)
• D. About 1.5 gallons (≈5–6 liters)

Answer: (D)

Verified step by step guidance

1. Understand that the problem is asking for the typical volume of blood in a healthy adult human body, which is a physiological fact rather than a calculation.
2. Recall that the average adult human body contains about 7-8% of its total body weight as blood volume.
3. Recognize that this blood volume typically translates to approximately 5 to 6 liters, which is roughly equivalent to 1.5 gallons.
4. Note that the other options (0.5 gallons, 3 gallons, 5 gallons) are either too low or too high compared to the established average blood volume in adults.
5. Conclude that the correct answer is about 1.5 gallons (≈5–6 liters), which aligns with standard human physiology data on blood volume.