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Osmoregulation is the active regulation of the osmotic pressure of an organism's fluids to maintain the hemeostasis of the organism's water content; that is, it keeps the organism's fluids from becoming too diluted or too concentrated. Osmotic pressure is a measure of the tendency of water to move into one solution from another by osmosis. The higher the osmotic pressure of a solution, the more water tends to move into it. Pressure must be exerted on the hypertonic side of a selectively permeable membrane to prevent diffusion of water by osmosis from the side containing pure water.Organisms in aquatic and terrestrial environments must maintain the right concentration of solutes and amount of water in their body fluids; this involves excertion (getting rid of metabolic wastes and other substances such as hornomes that would be toxic if allowed to accumulate in the blood) through organs such as the skin and the kidneys.
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