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

• A. About 1.5 gallons (about 5–6 liters)
• B. About 6 gallons (about 23 liters)
• C. About 3 gallons (about 11–12 liters)
• D. About 0.5 gallons (about 2 liters)

Answer: (A)

Verified step by step guidance

1. Understand that the problem is asking for the approximate volume of blood in a typical healthy adult human body, which is a physiological fact rather than a calculation.
2. Recall that the average adult human body contains about 5 to 6 liters of blood, which is a commonly accepted range in anatomy and physiology.
3. Convert liters to gallons if needed, knowing that 1 gallon is approximately 3.785 liters. This helps relate the volume in liters to gallons.
4. Use the conversion to estimate the volume in gallons: divide the volume in liters by 3.785 to find the equivalent in gallons.
5. Compare the calculated volume in gallons to the given options to identify the closest match, which reflects the typical blood volume in a healthy adult.