Fluid Compartments

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Intracellular
Fluid that has a high osmotic pressure due to enclosed proteins. It makes up 67% of total body fluid
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Interstitial
Fluid that contains free moving water and solutes, but no proteins. It also contains lymphatic fluid. It makes up 25% of total body fluid
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Plasma
Fluid that flows through the capillaries and has an endothelial layer. It freely allows the movement of water and solutes but proteins are trapped inside, creating an osmotic pressure. It makes up 8% of total body fluid
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Transcellular
Fluid contained within epithelial lined spaces, e.g. cerebrospinal fluid, ocular fluid or joint fluid
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Intracellular
Fluid that contains high levels of K+, low levels of Na+ and high levels of protein
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Interstitial
Fluid that contains low levels of K+, high levels of Na+ and no proteins
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Plasma
Fluid that contains low levels of K+, high levels of Na+ and high levels of protein
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Osmosis
The net movement of water across a semi-permeable membrane from an area of low solute concentration to an area of high solute concentration
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Osmotic pressure
The pressure applied to a pure solvent to prevent it from passing into a given solution by osmosis, often used to express the concentration of the solution
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Osmolarity
The total number of solute particles dissolved in a litre of solution (mOsmol/L)
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Osmolality
The total number of solute particles in one kg of solvent (mOsmol/kg)
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Tonicity
The ability of an extracellular solution to make water move into or out of a cell by osmosis. It is always relative to the cell and depends on the non-permeable solutes
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Other cards in this set

Card 2

Front

Fluid that contains free moving water and solutes, but no proteins. It also contains lymphatic fluid. It makes up 25% of total body fluid

Back

Interstitial

Card 3

Front

Fluid that flows through the capillaries and has an endothelial layer. It freely allows the movement of water and solutes but proteins are trapped inside, creating an osmotic pressure. It makes up 8% of total body fluid

Back

Preview of the back of card 3

Card 4

Front

Fluid contained within epithelial lined spaces, e.g. cerebrospinal fluid, ocular fluid or joint fluid

Back

Preview of the back of card 4

Card 5

Front

Fluid that contains high levels of K+, low levels of Na+ and high levels of protein

Back

Preview of the back of card 5
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