Where is the majority of water found in the human body?

The majority of water in the human body is found in the intracellular fluid, which is the fluid located within the cells. Approximately two-thirds of the body's total water volume is contained in this compartment. Intracellular fluid plays a critical role in maintaining cellular function, as it serves as the medium for biochemical reactions, nutrient transport, and waste removal.

In contrast, extracellular fluid, which includes interstitial fluid and blood plasma, comprises about one-third of the body's total water. Interstitial fluid bathes the cells and provides them with nutrients, while blood plasma is the liquid component of blood that carries cells, nutrients, and waste products throughout the body. Although these compartments are vital for overall bodily function, they collectively hold less water than the intracellular fluid.