excretion and hormones 22808

excretion and hormones...

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Themes Osmosis Diffusion Homeostasis Counter current exchange Active transport
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Excretion of Nitrogenous Wastes Nitrogenous wastes By-products of breaking down of proteins and amino acids. 1. Excreted as different chemicals depending on the habitat of the animals -- Ammonia -- Urea -- Uric acid
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1. Ammonia A small and toxic molecule Soluble in water In dilute environments Fishes and aquatic insects
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2) Urea Low toxicity Energetically expensive Mammals, turtles, most adult amphibians
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3) Uric acid Low toxicity Not soluble in water --Semi-solid paste! --Conserve water Most energetically expensive Insects, birds, many reptiles.
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Human Excretory System Maintains water balance Maintains solute balance Filters blood Eliminates toxins Eliminates nitrogenous wastes
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Basis of the excretory System Filtration --Filtrate collected from blood Reabsorption --Valuable substances reclaimed Secretion —Other substances extracted from body fluid and into waste Excretion —waste leaves the system
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The transport system Kidney—filters blood, produces urine Ureter—carries urine produced by kidneys to bladder Bladder—storage of urine Urethra—carries urine out of the body
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The Human Kidney Interesting information Allows life on dry land Approximately 1500 liters
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This note was uploaded on 05/11/2008 for the course EBIO 1220 taught by Professor Demig-addams during the Spring '07 term at Colorado.

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excretion and hormones...

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