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

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

Answer: (B)

Verified step by step guidance

1. Understand that the average volume of blood in a typical healthy adult human is generally measured in liters or gallons and depends on factors such as body size and sex.
2. Recall that the commonly accepted average blood volume for an adult is approximately 5 to 6 liters, which is roughly equivalent to about 1.5 gallons.
3. Recognize that the other options (0.5 gallons, 3 gallons, 5 gallons) are either too low or too high compared to the standard physiological range for blood volume in adults.
4. Convert liters to gallons if needed, using the conversion factor: 1 gallon ≈ 3.785 liters, to verify the approximate equivalence between liters and gallons.
5. Conclude that the correct estimate for blood volume in a typical healthy adult human is about 1.5 gallons (approximately 5–6 liters), based on standard physiological data.