In humans, the intracellular fluid makes up 67% of the total body water composition. Intracellular fluid– the body fluid located within the cell or all cells of an organism.Transcellular fluid (the fluid filling up the spaces of chambers formed from the linings of the epithelial cells) is the least in terms of the amount.Interstitial fluid (the fluid filling up the spaces between cells) is the major constituent.Interstitial fluid, intravascular fluid, lymph, and transcellular fluid make up the extracellular fluid. It makes up about 26% of the total body water composition in humans. Extracellular fluid – the body fluid located outside the cell or cells of an organism.In humans, the body fluid can be classified into two major types according to the location in the body: Image Credit: Otsuka Pharmaceutical Co., Ltd.Ī body fluid refers to any fluid produced by a living organism. Figure1: Human body water percentage at different stages of life. The maximum body fluid is present at the fetal development stage (~95%), which goes down to ~75% for an infant and eventually to ~50-60% in the adult stage (Figure 1). The body fluid content of the body changes with the body’s development. What percent of your body is water? or what percentage of water is the human body? The human body is primarily made up of water and the water distributed in different parts of the body organs and tissues is what defines the body fluid. Some example of body fluid includes blood plasma, tears, synovial fluid, sweat, and urine. The functions of water in the body include temperature regulation, moistening of tissues, transportation of essential nutrients, elimination of waste from the body, and lubricating different joints and tissues.
The body fluid or the physiologic fluid is essential for various physiological processes and the maintenance of body homeostasis. Depending on the location of the body fluid, the composition and amounts vary. Apart from water, the body fluid is also composed of other molecules, such as electrolytes ( sodium, potassium, etc), metabolites (urea, glucose, carbon dioxide, oxygen), and proteins (albumin, hormones, amino acids, antibodies).
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