Excretion(1)

Excretion(1) - General Biology 101 Dr. Morrison Lecture:...

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General Biology 101 Dr. Morrison Lecture: Dying of Thirst #1 If you were dying of thirst in a life boat, should you drink sea water? Why or why not? Relevant information Sea water is 3% salt, 97% water. Human body is 70-80% water overall. Interstitial fluids are ? IV saline solution is ? Osmosis The movement of water molecules from areas of high water concentration to areas of low water concentration OR from areas of low salt concentration to areas of high salt concentration. What happens in gut? See drawing on board Dying of Thirst #2 If dying of thirst in the desert, should you drink your own urine? Excretion Means ridding the body of nitrogenous waste products of protein metabolism Does not include “defecation.” Proteins are chains of amino acids. Each amino acid contains an amine group (-NH 2 ) -NH 2 group converts to ammonia (NH 3 ) Excretion strategies Dilute with water (aquatic animals) Convert to less toxic form (terrestrial)
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This note was uploaded on 09/28/2010 for the course BIO 101 taught by Professor Martin during the Fall '08 term at Rutgers.

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Excretion(1) - General Biology 101 Dr. Morrison Lecture:...

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