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Extracellular fluid makes up about one-third of body fluid, the remaining two-thirds is intracellular fluid within cells. [3] The main component of the extracellular fluid is the interstitial fluid that surrounds cells.
The main intravascular fluid in mammals is blood, a complex mixture with elements of a suspension (blood cells), colloid (), and solutes (glucose and ions).The blood represents both the intracellular compartment (the fluid inside the blood cells) and the extracellular compartment (the blood plasma).
The total body of water is divided into fluid compartments, [1] between the intracellular fluid compartment (also called space, or volume) and the extracellular fluid (ECF) compartment (space, volume) in a two-to-one ratio: 28 (28–32) liters are inside cells and 14 (14–15) liters are outside cells.
In a 72 kg (159 lb) body containing 40 litres of fluid, about 25 litres is intracellular, [9] which amounts to 62.5%. Jackson's texts states 70% of body fluid is intracellular. [10] Extracellular fluid (1/3 of body water) is fluid contained in areas outside of cells. For a 40-litre body, about 15 litres is extracellular, [9] which amounts to 37.5%.
Euvolemia is the state of normal body fluid volume, including blood volume, interstitial fluid volume, and intracellular fluid volume; hypovolemia and hypervolemia are imbalances. Water is necessary for all life on Earth. Humans can survive for 4 to 6 weeks without food but only for a few days without water.
Within the body, water is classified as intracellular fluid or extracellular fluid. Intracellular fluid refers to water that is contained within the cells. This consists of approximately 57% of the total body water weight. [19] Fluid inside the cells has high concentrations of potassium, magnesium, phosphate, and proteins. [21] Extracellular ...
As cell membranes in general are freely permeable to water, the osmolality of the extracellular fluid (ECF) is approximately equal to that of the intracellular fluid (ICF). Therefore, plasma osmolality is a guide to intracellular osmolality.
Perilymph is the fluid contained within the bony labyrinth, surrounding and protecting the membranous labyrinth; perilymph resembles extracellular fluid in composition (sodium salts are the predominant positive electrolyte) and, via the cochlear aqueduct (sometimes referred to as the "perilymphatic duct"), is in continuity with cerebrospinal fluid.