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BIOL 130L (2)

Water Balance.docx

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University of Waterloo
Rachel Persaud

111212 Water BalanceHumans and other vertebrates require a stable aqueous environment to survive and thus must maintain and replenish it all the timeBecause water is not abundant on land terrestrial organism require mechanisms to conserve water and maintain a balance of solutesTo maintain the proper water balance the body must regulate urine output o Water InputDrinkFood o Water OutputUrineSweatEvaporationFeces More urine is produced when water intake is high and less when water intake is low Thisbalancing act is achieved through the interaction of the nervous and endocrine systems Osmosis Osmosis is the movement of water through a semipermeable membrane from an area of low solute concentration to an area of high solute concentration Osmotic pressure is the pressure that results from a difference in water concentration or a water concentration gradient between the two sides of the membrane The greater the water concentration gradient the greater the osmotic pressure difference Hyperosmotic The solution on one side of the permeable membrane that has the lower concentration of water Hypoosmotic The solution on one side of the permeable membrane that has the higher concentration of water Isoosmotic The two solutions that have equal water concentrations Typically water continues to move until the two solutions are isoosmotic and then movement is equal in both directions still moving but at equal proportions
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