Define Tonicity?
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☑ Required Answer-
Tonicity is a measure of the effective osmotic pressure gradient; the water potential of two solutions separated by a semipermeable cell membrane. In other words, tonicity is the relative concentration of solutes dissolved in solution which determine the direction and extent of diffusion.
The ability of an extracellular solution to make water move into or out of a cell by osmosis is known as its tonicity. Tonicity is a bit different from osmolarity because it takes into account both relative solute concentrations and the cell membrane's permeability to those solutes.
EXAMPLES. Tonicity is the reason why salt water fish cannot live in fresh water and vice versa. A salt water fish's cells have evolved to have a very high solute concentration to match the high osmolarity of the salt water they live in.
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