In a typical healthy adult, approximately how much blood is contained in the human body?

• A. About 5 liters (approximately 4–6 L)
• B. About 1 liter (approximately 0.5–1.5 L)
• C. About 20 liters (approximately 18–22 L)
• D. About 10 liters (approximately 9–11 L)

Answer: (A)

Verified step by step guidance

1. Understand that the problem is asking for the typical volume of blood in a healthy adult human body, which is a standard physiological fact rather than a calculation problem.
2. Recall that blood volume varies depending on factors such as body size, sex, and health status, but there is a generally accepted average range for adults.
3. Recognize that the average blood volume in a healthy adult is approximately 7-8% of their total body weight. This percentage can be used to estimate blood volume if body weight is known.
4. For example, if you know the average adult body weight (around 70 kg), you can calculate blood volume using the formula: \(\text{Blood Volume} = \text{Body Weight} \times 0.07\) to \$0.08$.
5. Using this estimation, you will find that the blood volume is roughly around 5 liters, which matches the typical accepted range of 4 to 6 liters for a healthy adult.