Sodium ion is necessary for generation and conduction of action potentials and contributes nearly half of the osmotic pressure of extracellular fluid.
Osmotic pressure is the minimum pressure which needs to be carried out to a solution to save you the inward go with the flow of its pure solvent across a semipermeable membrane.
It is also described because the measure of the tendency of a approach to soak up a pure solvent by using osmosis. Osmotic pressure stops the drift of water through a semipermeable membrane.
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