![]() ![]() Wilkins R, Cross S, Megson I, Meredith D, editors. Water, electrolytes and acid-base balance. Note: Numerical data in the diagram is from reference 2.ġ. In a healthy individual, fluid is divided between these functional compartments in certain ratios. The diagram below illustrates the values for total body water and fluid distribution based on a 70 kg man and are approximate values. Fluid compartment studies were carried out over a period of 3 hours, and plasma hemoglobin and hematocrit changes were measured for 8 hours. Fluid within the body can be thought of as separated into several functional compartments divided by semi-permeable membranes which allow free movement of water but not of certain classes of solutes. The plasma and interstitial fluid are separated by the capillary wall. cerebrospinal fluid, synovial fluid, digestive secretions, peritoneal fluid, intraocular fluid and pleural ![]() Transcellular fluid is enclosed within epithelial lined spaces (e.g.Interstitial fluid surrounds the cells and.The extracellular fluid is further subdivided into the following body fluid compartments: About two-thirds is in the intracellular fluid compartment (ICF). The intracellular fluid and extracellular fluid are separated by cell membranes. There are two main fluid compartments water occupies in the body. Extracellular fluid, which is found outside the cells. ![]() Intracellular fluid, which is found inside the cells.The distribution of total body water is divided into two major body fluid compartments: Fluid within the body can be thought of as separated into several functional compartments divided by semi-permeable membranes which allow free movement of water but not of certain classes of solutes. This is mostly due to a decrease in muscle mass and an increase in body fat. In old age, the total body water percentage decreases. These differences in total body water percentage between men and women are because of women typically having less muscle mass and a greater amount of adipose tissue than men. In healthy lean people, the total body water comprises 50-60% of body weight in men and 45-50% of body weight in women. Since this is likely realized through renin/aldosterone-mediated salt and water retention, other body fluid compartments may be changed too. ![]()
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