osmo - osmosis
regulation - to control
osmoregulation - control of blood composition
cells in the tissue fluid are isotonic with the cytoplasm of the cells - means water going in and out of cells is equal (maintain size and function)
danger to tissue - blood circulating into the tissue would be concentrated causing a hypertonic tissue fluid (remove to much water) or a hypotonic tissue fluid (add to much water)
need to control - achieved by controlling the composition of the blood
kidney controls the composition
excess salts and water is excreted in the kidney so this controls the blood
this maintains the cells functions
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