What percentage of the human body is composed of fluids?

The human body is composed of approximately 60% fluids, which is essential for various physiological functions. This fluid composition includes water present in blood, lymph, and intracellular and extracellular spaces, facilitating critical processes such as circulation, temperature regulation, nutrient transport, and waste elimination.

The 60% figure reflects that different tissues have varying fluid contents—muscle tissue, for instance, contains more water compared to adipose (fat) tissue. This percentage can vary somewhat with factors like age, gender, and body composition, but 60% serves as the generalized standard for a healthy adult.

Understanding the fluid composition highlights the importance of maintaining proper hydration and electrolyte balance, as disturbances in these levels can lead to significant health issues.