Approximately how many gallons of blood are in the average adult human body?

• A. About 0.25 gallon
• B. About 3–4 gallons
• C. About 1–1.5 gallons
• D. About 6–7 gallons

Answer: (C)

Verified step by step guidance

1. Understand that the average adult human body contains a certain volume of blood, which is typically measured in liters or gallons.
2. Recall that the average blood volume in adults is roughly 7-8% of their total body weight. For an average adult weighing about 70 kg (154 lbs), this translates to approximately 5-6 liters of blood.
3. Convert the volume from liters to gallons, knowing that 1 gallon is approximately 3.785 liters. Use the formula: \(\text{Gallons} = \frac{\text{Liters}}{3.785}\).
4. Calculate the approximate range of blood volume in gallons by dividing the estimated liters of blood (5-6 liters) by 3.785 liters per gallon.
5. Compare the calculated range to the given options to identify which one best matches the typical blood volume in an average adult human.