[oz-moh-reg-yuh-ley-shuh
n, os-] 
| the process by which cells and simple organisms maintain fluid and electrolyte balance with their surroundings. |
| os·mo·reg·u·la·tion (ŏz'mə-rěg'yə-lā'shən, ŏs'-) n. Maintenance of an optimal, constant osmotic pressure in the body of a living organism. [osmo(sis) + regulation.] os'mo·reg'u·la·to'ry (-lə-tôr'ē, -tōr'ē) adj. |
osmoregulation n.
The maintenance of an optimal constant osmotic pressure in the body of a living organism.
osmoregulation
in biology, maintenance by an organism of an internal balance between water and dissolved materials regardless of environmental conditions. In many marine organisms osmosis (the passage of solvent through a semipermeable membrane) occurs without any need for regulatory mechanisms because the cells have the same osmotic pressure as the sea. Other organisms, however, must actively take on, conserve, or excrete water or salts in order to maintain their internal water-mineral content.
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