BIOL130L Chapter : Water Balance.docx
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20 Jul 2013
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Humans and other vertebrates require a stable aqueous environment to survive, and thus must maintain and replenish it all the time. Because water is not abundant on land terrestrial organism require mechanisms to conserve water and maintain a balance of solutes. To maintain the proper water balance, the body must regulate urine output: water input: More urine is produced when water intake is high and less when water intake is low. Balancing act is achieved through the interaction of the nervous and endocrine systems. Osmosis is the movement of water through a semi-permeable 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.
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