What is the normal amount of blood in a human body?

What is the normal amount of blood in a human body?

• A. 3.5 liters
• B. 7.0 liters
• C. 4.5 liters
• D. 5.6 liters

Answer: (D)

Total blood volume in an adult is about 4.5 to 6.0 liters, roughly 7–8% of body weight. This means a person of average size often has around 5 liters of blood, with 5.6 liters sitting comfortably inside the normal range. The other values are outside the typical range for most adults: 3.5 liters is low, 4.5 liters is possible but on the low end, and 7.0 liters would be high for many people. So 5.6 liters is the best estimate for a normal amount of blood in a typical adult.

Total blood volume in an adult is about 4.5 to 6.0 liters, roughly 7–8% of body weight. This means a person of average size often has around 5 liters of blood, with 5.6 liters sitting comfortably inside the normal range. The other values are outside the typical range for most adults: 3.5 liters is low, 4.5 liters is possible but on the low end, and 7.0 liters would be high for many people. So 5.6 liters is the best estimate for a normal amount of blood in a typical adult.