Alternatively, if a cell is placed in a solution that is more concentrated (known as a hypertonic solution) water moves from inside the cell to the outside, causing it to shrink. The total body water is divided into compartments and useful physiological insight and some measure of clinical predictability can be gained from this approach even though most of these fluid compartments do not exist as discrete real fluid collections.\)). Electrolytes are substances that, when dissolved in water, disassociate into charged ions. The electrolyte composition of the various transcellular fluids are quite dissimilar and typical values or ranges for some of these fluids are listed in the Table. Although water makes up the largest percentage of body volume, it is not actually pure water but rather a mixture of cells, proteins, glucose, lipoproteins, electrolytes, and other substances. The fluid fluxes involved with GIT fluids can be quite significant. ![]() It is important because of the specialised functions involved. It includes CSF, GIT fluids, bladder urine, aqueous humour and joint fluid. It is contained within epithelial lined spaces. Transcellular fluid is a small compartment that represents all those body fluids which are formed from the transport activities of cells. This fluid is mobilised only very slowly and this lessens its importance when considering the effects of acute fluid interventions. The fluid of bone
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