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Fluid Movement - Physiology (view source)
Revision as of 14:11, 12 August 2008
, 14:11, 12 August 2008no edit summary
'''Concentration = Number of dissolved particles ÷ volume'''
'''Concentration = Number of dissolved particles ÷ volume'''
Therefore if concentration is to remain constant volume must increase to compensate for an increase in the number of dissolved particles
==Ions and Osmolarity==
The Osmolarity of the the various compartments is determined by differant 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.
==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.