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Kidneys and Excretory System

Kidneys and Excretory System. How Urination works. http://health.howstuffworks.com/adam-200032.htm. Excretion. The process of excretion involves the removal of metabolic waste. If wastes build up in the body, they become toxic. There are 4 main organs that work to remove waste from the body.

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Kidneys and Excretory System

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  1. Kidneys and Excretory System

  2. How Urination works • http://health.howstuffworks.com/adam-200032.htm

  3. Excretion • The process of excretion involves the removal of metabolic waste. • If wastes build up in the body, they become toxic. • There are 4 main organs that work to remove waste from the body.

  4. Excretion con’t • The skin - removes waste heat, some urea, and other materials found in sweat 2. The lungs - removes C02 3. The large intestine - removes solid wastes of the digestive process 4. The kidneys - removes urea, uric acid, extra water and salts

  5. Anterior View of the Urinary System

  6. Posterior View of the Urinary System

  7. Questions page 380 1-3 • List 3 main functions of the kidney. a. Eliminates wastes b. regulation of water balance - Also regulation of pH - Also regulates blood pressure and is involved in the production of red blood cells.

  8. Questions page 380 1-3 con’t 2. What is deamination and why is it an important process? • Deamination is the removal of the amino groups from a protein (organic compound) • Amino groups = 2 H + 1 N

  9. Questions page 380 1-3 con’t 2 con’t • Deamination occurs in the liver • Important to convert excess amino acids into carbohydrates and other nutrient compounds

  10. Questions page 380 1-3 con’t 3. How does the formation of urea prevent poisoning? - Deamination produces ammonia, a water soluble gas. - Ammonia is extremely toxic and cannot be stored in the body. - The liver combines two molecules of ammonia with carbon dioxide to form urea. - Urea is 1000 times less toxic than ammonia. • Animals can store urea for short periods of time in their bodies • Permits the controlled excretion of urine

  11. Questions page 383 4-5 4. State the function… • Bowman’s capsule: The filtration of water and dissolved solutes happens as blood is forced from the glomerulus to the Bowmen’s capsule • Proximal tubule: Selective reabsorption of nutrients from filtrates back into the blood • Loop of Henle: Reabsorption of water and salt • Distal Tubule: secretion of substances from the blood to the urine • Collecting duct: Urine formation

  12. The urethra is the only part of the urinary system that differs between males and females. It is longer in males.

  13. Questions page 319 4-5 con’t 5. List and describe the 3 processes involved in urine formation. • Filtration – involves the movement of fluids from the Bowman’s capsule to the glomerulus. • Reabsorption – involves the movement of fluids from the nephron into the interstitial fluid and eventually the capillary net. • Secretion – involves the selective transport of fluids from the capillary net into the nephron.

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