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Excretory system

Explore the purpose of excretion in eliminating wastes such as carbon dioxide, mineral salts, nitrogenous wastes, water, and heat. Learn how your body loses waste through lungs, skin, and urinary tract. Delve into the filtration mechanism of nephrons and the contents of urine. Understand homeostasis and how the body maintains internal balance. Discover why eliminating waste is crucial for cell survival.

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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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