What percentage of the human body is made up of water molecules?

The human body is composed of approximately 60% water, which is vital for many physiological processes. Water is essential for maintaining homeostasis, regulating temperature, facilitating digestion, and acting as a solvent for biochemical reactions. The percentage can vary based on factors such as age, gender, and body composition, but around 60% is the standard figure used for an average adult.

In infants, the percentage can be even higher, around 75-78%, which decreases as they grow older. This highlights the importance of water in the development stage. Adequate hydration is crucial for cellular function, nutrient transport, and waste elimination, underscoring the necessity of maintaining proper hydration levels throughout life.