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==Definitions==
 
==Definitions==
 
*'''''Osmosis''''' is the ''net movement'' of water across a semi permeable membrane. The movement is caused by a concentration gradient due to different solute concentrations on each side of the membrane.
 
*'''''Osmosis''''' is the ''net movement'' of water across a semi permeable membrane. The movement is caused by a concentration gradient due to different solute concentrations on each side of the membrane.
   
*'''''Osmotic Pressure''''' is the pressure caused by the solutes within the solution. The solute concentration prevents water movement across the membrane.
 
*'''''Osmotic Pressure''''' is the pressure caused by the solutes within the solution. The solute concentration prevents water movement across the membrane.
   
*'''''Tonicity''''' is the term used to compare the osmotic pressure of different solutions
 
*'''''Tonicity''''' is the term used to compare the osmotic pressure of different solutions
 
**A ''hypotonic'' solution is one that has an osmotic pressure '''lower''' than plasma.
 
**A ''hypotonic'' solution is one that has an osmotic pressure '''lower''' than plasma.
 
**A ''isotonic'' solution is one that has an osmotic pressure '''the same''' than plasma.
 
**A ''isotonic'' solution is one that has an osmotic pressure '''the same''' than plasma.
 
**A ''hypertonic'' solution is one that has an osmotic pressure '''higher''' than plasma.
 
**A ''hypertonic'' solution is one that has an osmotic pressure '''higher''' than plasma.
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*''''''Hypovolaemia''''' is a reduction in normal blood volume which can be caused by:
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** Excessive sweating
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** Water deprivation
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** [[Control of Feeding - Anatomy & Physiology#The Vomit Reflex|Vomiting]] and [[Diarrhoea|diarrhoea]]
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** [[Haemorrhage - Pathology|Haemorrhage]]
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** Pathological dilatation of capacity of the ciruclatory system, and therefore a relative reduction in circulating blood.
    
==Types of Fluids==
 
==Types of Fluids==
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