Respiration (4.4.2)

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  • Respiration (4.4.2)
    • Aerobic Respiration
      • Aerobic respiration is an exothermic reaction that is continuously occurring in living cells to supply all the energy needed for living processes and that it can be represented by the equation:
        • Glucose + Oxygen          -------->.   Carbon Dioxide + Water
    • Respiration in cells can take place aerobically (with oxygen) or anaerobically (without oxygen) to transfer energy.
    • Organisms need energy for:
      • chemical reactions to build larger molecules.
      • movement.
      • keeping warm.
    • As the oxidation of glucose is incomplete in anaerobic respiration, much less energy is transferred than in aerobic respiration
    • Anaerobic respiration
      • Anaerobic respiration in muscles is represented by the equation:
        • Glucose ---> Lactic acid
      • Anaerobic respiration in plant and yeast cells is represented by the equation:
        • Glucose ---> Ethanol + Carbon Dioxide
      • Anaerobic respiration in yeast cells is called fermentation.
      • Explain: the economic importance of fermentation in the manufacture of bread and alcoholic drinks.
    • Compare: the processes of aerobic and anaerobic respiration with regard to the need for oxygen, differing products and the relative amounts of energy transferred.

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