Washington Master Esthetics Practice Exam

Which of the following statements about blood volume in individuals is accurate?

1. It varies regardless of body weight.

2. It is inversely related to body mass.

3. It typically weighs about 20 pounds for a 200-lb person.

4. It is consistent across all adult individuals.

The correct answer is: It typically weighs about 20 pounds for a 200-lb person.

The statement that blood volume typically weighs about 20 pounds for a 200-lb person is accurate because, on average, an adult's blood volume is approximately 7–8% of their total body weight. For a person who weighs 200 pounds, this percentage translates to roughly 14 to 16 pounds of blood, aligning closely with the figure presented in the statement. Understanding blood volume in this way highlights how it scales with body weight, which is an important consideration in fields related to health and physiology. In contrast, the other statements present incorrect or overly broad generalizations: blood volume does indeed vary based on several factors, including body composition, age, and sex, which contradicts any idea of it being consistent across all adults. Moreover, the relationship of blood volume to body mass is not inverse; rather, it is proportional to body weight, meaning heavier individuals typically have more blood volume.