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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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purpose of excretion
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
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
diagram of nephron
Diagram of nephron

Go to http://www.biologymad.com/resources/kidney.swf

filter mechanism
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.
contents of urine
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
homeostasis
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
in conclusion
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