B3 - C

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  • Created by: zoolouise
  • Created on: 02-06-15 18:44
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  • Respiration
    • Why is respiration important?
      • Respiration releases energy from food, this energy is trapped in a molecule called ATP.
        • The energy from ATP can then be used to provide the energy for different processes in living organisms.
    • Aerobic respiration
      • C6H12O6+602 > C602 + 6H20
      • Glucose + Oxygen > Carbon Dioxide + Water
    • Anaerobic respiration
      • During exercise, despite the increase in breathing and heart rate, muscles often don't get enough oxygen and therefore anaerobic respiration is used as well as aerobic.
      • Glucose > Lactic acid (+energy)
      • Anaerobic respiration has disadvantages over aerobic.
        • The lactic acid made by anaerobic respiration builds up in muscles, causing pain and fatigue.
          • Anaerobic respiration releases much less energy per glucose molecule than aerobic.
    • Measuring respiration rate
      • RQ = carbon dioxide produced / oxygen used
      • It's possible to do experiments to measure the rate of respiration, you can measure how much oxygen is used up - the faster consumed, faster respiration rate
        • The rate at which carbon dioxide is made
      • The metabolic rate is described as the sum of the reactions occurring in the body.


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