Answer:
The total volume of water corresponds to 60% of body weight. This volume is divided into two large compartments, the intracellular and the extracellular. The extracellular compartment is subdivided into plasma and interstitial fluid, with a volume ratio of approximately 1: 3. Regulation of intracellular volume is achieved in part by regulating plasma osmolality through changes in water balance.
Step-by-step explanation:
Water is distributed in our body in different aqueous compartments, which are separated by cell membranes: intracellular fluid and extracellular fluid, which in turn includes interstitial fluid and plasma. Osmotic forces are the fundamental determinant of the distribution of water in the body, water can freely cross almost all cell membranes, and as a result the body fluids are kept in an osmotic balance, since the osmolality of the intra and extracellular fluid is the same. Intracellular fluid makes up about 40% of body weight: 28-42L of body fluid is within cells. Extracellular fluid constitutes about 20% or about 14 liters in a normal adult, all the fluids outside the cells. Plasma is the non-cellular part of the blood and it continually exchanges substances with the interstitial fluid through pores of the capillary membranes that are permeable to almost all the solutes in the extracellular fluid except for proteins. The distribution of the liquid between the intra and extracellular compartments is determined by the osmotic effect of the smallest solutes (Na, cl ...) that act through the cell membrane, since the cell membrane is very permeable to water and impermeable to ions small, water moves rapidly through the cell membrane, and the extracellular fluid remains isotonic with the extracellular fluid.