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Excretion in Humans (part 1): Intro to Excretion

Students should be able to: <br>- define excretion and explain the importance of removing nitrogenous and other compounds from<br>the body

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Excretion in Humans (part 1): Intro to Excretion

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  1. Chapter 11

  2. Chapter 11 Excretion Learning Objectives: • Define excretion as the removal of toxic materials and the waste products of metabolism from organisms. • Describe the removal of carbon dioxide from the lungs.

  3. Chapter 11 Excretion Learning Objectives: • Identify on diagrams and name: kidneys, bladder, urethra; and state the function of each. • Describe dialysis in kidney machines as the diffusion of waste products and salts (small molecules) through a membrane – large molecules (e.g. protein) remain in the blood.

  4. Chapter 11 Excretion • Please write down on the piece of paper what do you think are the products of excretion? Answer : Main waste products are carbon dioxide, urea, excess water & excess heat. NOT FAECES!!

  5. Chapter 11 Excretion Excretion is the removal of toxic materials and the waste products of metabolism from the body. Egestion is the removal of undigested food matter which have never been involved in the metabolic activities of cells, from the alimentary canal. faeces

  6. Metabolism = Anabolism + Catabolism Anabolism: The building up of complex substances from simpler ones with an intake of energy

  7. Example of Anabolism: Synthesis of glycogen from glucose (Chapter 4 pg 57) Glycogen Glucose molecules

  8. Catabolism : The breakdown of complex substances into simpler substances with the release of energy. Examples: 1) Tissue respiration (chpt 10, pg 195) enzymes C6H12O6 + 6O2 6CO2+ 6H2O + Energy

  9. 2) Breakdown of excess amino acids to urea (Deamination) (chpt 6 pg 108) R NH2-CH-COOH deamination carbon residue amino group ammonia glucose (toxic to cells) glycogen (stored in liver and muscles) urea (non toxic,excreted in urine)

  10. Metabolism…. • Metabolism produces waste products • When present in high concentration… WASTE PRODUCTS become TOXIC!! Therefore, waste products must be excreted from the body

  11. Excretory Organs in Man Liver (chpt 6) Lungs (chpt 10) Kidneys (chpt 11) Skin (chpt 12)

  12. Excretory Products in Man 1)Carbon Dioxide excreted mainly via 2) Excess Water excreted mainly via also thru’ &

  13. Excretory Products in Man excreted mainly via 3) Urea 4) Excess Heat excreted mainly via

  14. Excretory Products in Man are produced by the breakdown of haemoglobin in 5) Bile Pigments Excreted in the faeces

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