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

• A. About 5 liters
• B. About 10 liters
• C. About 20 liters
• D. About 1 liter

Answer: (A)

Verified step by step guidance

1. Understand that the question asks for the approximate volume of blood in a typical healthy adult human body.
2. Recall that blood volume varies depending on factors such as body size and sex, but there is a general average range used in physiology.
3. Remember that the average blood volume in adults is often estimated as about 7-8% of total body weight.
4. For an average adult weighing around 70 kg, calculate the blood volume by multiplying body weight by the percentage (e.g., 70 kg \times 0.07 to 0.08).
5. Convert the resulting mass of blood (in kilograms) to liters, knowing that 1 kg of blood roughly equals 1 liter, to find the approximate blood volume.