Approximately 2/3 of the body fluid is held intracellularly.

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Intracellular fluid refers to the fluid held within the cells, while extracellular fluid refers to the fluid outside of the cells. The human body is composed of approximately 60% water, and about two-thirds of that water is held within the cells as intracellular fluid. The remaining one-third is extracellular fluid, which consists of interstitial fluid (fluid in the spaces between cells) and plasma (fluid in the blood vessels).

Approximately 2/3 of the Body Fluid Is Held Intracellularly