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Excretory system

Excretory system. Purpose of excretion. To eliminate wastes. Wastes to lose are: Carbon dioxide Mineral salts, Na, Cl , K, Nitrogenous wastes from digesting protein, Urea, Uric acid Water Heat. Three ways your Body can lose wastes. 1. Through your lungs by breathing

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Excretory system

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  1. Excretory system

  2. Purpose of excretion • To eliminate wastes. • Wastes to lose are: • Carbon dioxide • Mineral salts, Na, Cl, K, • Nitrogenous wastes from digesting protein, Urea, Uric acid • Water • Heat

  3. Three ways your Body can lose wastes • 1. Through your lungs by breathing • Carbon dioxide and water • 2. Through the skin by sweating • Water, NaCl, Urea(minimal) • 3. Through the urinary tract by peeing • Urea, Uric acid, excess salt, excess water

  4. Diagram of nephron Go to http://www.biologymad.com/resources/kidney.swf

  5. Filter mechanism • Nephrons: • Each kidney has 1,000,000 • Bowman’s Capsule filters the blood. It squeezes water, glucose, vitamins, salt, urea, uric acid out of the blood into the nephron. • Loop of Henle reabsorbs any glucose and salt it needs . The water follows the salt by osmosis.

  6. Contents of Urine • Excess Water • Urea • Uric acid • Excess Electrolytes (potassium, sodium, chloride) • Excess vitamins (C, B complex) • Urochrome (Yellow pigment) • Heat • If you have health problems you may have Glucose or Proteins

  7. Homeostasis • This is the control of the body’s internal environment. It needs to be kept relatively steady. • Water- lungs, sweat, kidneys (urine) • Electrolytes (salts)- sweat, urine • Heat- Controlling blood flow to skin, sweating, shivering, urine • Blood sugar- release and storage of glucose controlled by insulin

  8. In Conclusion • We eliminate salt so our cells won’t shrivel and die • We eliminate water so our cells won’t drown • We eliminate CO2 so our cells don’t asphyxiate • We eliminate urea and uric acid so our cells don’t get poisoned

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