What percentage of the body is composed of water according to the 60/40/20 rule?

• A. 40%
• B. 60%
• C. 20%
• D. 80%

Answer: (B)

The 60/40/20 rule is a guideline that describes the distribution of body composition in humans, specifically indicating that approximately 60% of the human body is water. This percentage reflects the total body water relative to the total body weight. The water is distributed between two main compartments: intracellular fluid (inside the cells) and extracellular fluid (outside the cells). Understanding this composition is crucial in physiology, as water plays vital roles in numerous physiological processes, including temperature regulation, nutrient transport, waste elimination, and acting as a solvent for biochemical reactions. This foundational understanding highlights the importance of maintaining proper hydration for overall health and physiological function.