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

• A. About 3 gallons
• B. About 1.5 gallons
• C. About 0.5 gallon
• D. About 5 gallons

Answer: (B)

Verified step by step guidance

1. Understand that the average volume of blood in a healthy adult human is typically measured in liters or gallons and depends on factors like body size and sex.
2. Recall that the average adult has about 4.5 to 5.5 liters of blood circulating in their body.
3. Convert liters to gallons using the conversion factor: 1 gallon is approximately 3.785 liters.
4. Calculate the approximate number of gallons by dividing the average blood volume in liters by 3.785 liters per gallon using the formula: \(\text{Gallons} = \frac{\text{Liters of blood}}{3.785}\).
5. Compare the calculated value to the given options to identify the closest estimate of blood volume in gallons.