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Fluid Movement - Physiology (view source)
Revision as of 19:53, 14 January 2010
, 19:53, 14 January 2010→Ions and Osmolarity
==Ions and Osmolarity==
==Ions and Osmolarity==
The Osmolarity of the various compartments is determined by different ions. Most of the bodies K<sup>+</sup> resides intracellulary and it is this and other organic anions which determine the intracellular osmolarity. On the other hand the osmolarity of the ECF is over 90% determined by Na<sup>+</sup> and the anions which follow it. As osmolarity is kept fairly constant the Na<sup>+</sup> levels in the ECF determine its volume.
The Osmolarity of the various compartments is determined by different ions. Most of the bodies K<sup>+</sup> resides intracellularly and it is this and other organic anions which determine the intracellular osmolarity. On the other hand the osmolarity of the ECF is over 90% determined by Na<sup>+</sup> and the anions which follow it. As osmolarity is kept fairly constant the Na<sup>+</sup> levels in the ECF determine its volume.
==Water Replacement==
==Water Replacement==
When water is ingested it actually takes a rather long time (30-60mins) before the equilibrium is reset between the ECF and ICF. This is mainly because it takes time to distribute the water between the organs of the body after it is absorbed.
When water is ingested it actually takes a rather long time (30-60mins) before the equilibrium is reset between the ECF and ICF. This is mainly because it takes time to distribute the water between the organs of the body after it is absorbed.