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Fluid Movement - Physiology (view source)
Revision as of 13:31, 12 August 2008
, 13:31, 12 August 2008no edit summary
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==Water in the Body==
Water is a very important substance in the body making up aroximately 70% of it. Over 50% of that water is found in cells refered to as the '''intracellular fluid'''. The remainder makes up the base of the fluid surrounding the cell which is refered to as the '''extracellular fluid''' or '''ECF'''.
====Extracellular Fluid====
The extracellular fluid is subdivided into three parts:
* The plasma of the blood
* Tissue fluid (interstitial fluid)
* Lymph fluid
==Water Movement==
Water is able to move between the various compartments easily. The movement is determined by the following:
* Differances in hydrostatic pressure
* Differances in osmotic pressure
These forces play differant roles depending on the structure being crossed. Both influence passage across capillary walls however only osmotic pressure influences that movement across cell membranes. The reason hydrostatic pressure has little influence over the transport across cell membranes is that the hydrostatic pressure of the intracellular and interstitial fluid is relatively constant.
==The Effects of [[Useful definitions - Renal Anatomy & Physiology| Osmolarity]]==