Chapter 35-Excretion - Chapter 35: The Urinary System...

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Chapter 35: The Urinary System
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Excretion Elimination Elimination of substances ( waste waste ) from the body
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Excretion Occurs in: Respiratory Respiratory System - Carbon dioxide waste Digestive Digestive System - Undigested material (feces) Urinary Urinary System - Eliminates the nongaseous waste products of cellular metabolism (the urea from amino acid metabolism), excess water, excesses of certain vitamins, and some drugs
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Other Functions of the Excretory System Regulates water Regulates water content in blood Regulating blood ion and nutrient nutrient levels Na, K, Cl, Ca, glucose, amino acids Maintains proper proper blood pH blood pH Secretes hormones
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Simpler organisms have simpler excretory systems
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Flatworms Flatworms Excrete using protonephridia protonephridia (to regulate water balance) A network of branches branches through body
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Branches end at single-celled bulbs ( Flame cells Flame cells ) that are covered in beating cilia cilia
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Insects Excretory systems consist of malpighian malpighian tubules tubules
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Malpighian Tubules In the intestine intestine and rectum rectum Important salts are secreted back into blood by active transport Water follows by osmosis Insects can produce very concentrated concentrated urine urine , excreted with feces
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Earthworms Earthworms have excretory organs that resemble human kidneys
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This note was uploaded on 05/27/2011 for the course BIO 112 taught by Professor Kirkpatrick during the Spring '11 term at Moraine Valley Community College.

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Chapter 35-Excretion - Chapter 35: The Urinary System...

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