B9- Respiration

  • Created by: liv.moz
  • Created on: 28-04-22 18:20
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  • Respiration
    • What happens?
      • It is the process where energy is released in our body
        • Happens in an organelle found in our cells called the mitochondria.
        • Chemical reaction which occurs in all living cells, releasing energy from glucose.
        • More energy is released in MAKING bonds than BREAKING bonds in respiration.
      • Aerobic respiration occurs with oxygen, releases more energy but more slowly.
      • Anaerobic respiration occurs without oxygen, releases less energy but more quickly.
    • Aerobic respiration
      • Occurs in the PRESENCE OF OXYGEN.
      • glucose + oxygen= carbon dioxide+ water
      • Slowly releases lots of energy stored in glucose.
        • Mostly occurs in the mitochondira, found in the cytoplasm.
      • Cells which require lots of energy have lots of mitochondria.
        • Muscle cells need lots of energy for us to be able to move.
        • Sperm cells also have lots of mitochondira as they need energy to swim towards the egg cell.
    • Purpose of Respiration
      • Muscles for movement.
      • Active transport
      • To help maintain constant internal temperature.
      • For building larger molecules from smaller ones.
      • For digestion.
    • Anaerobic respiration
      • Glucose --> lactic acid
        • Lactic acid builds up in the muscles leaving us tired and causing pain.
          • Can lead to a cramp.
          • Lactic acid needs to be oxidised to carbon dioxide and water
      • Releases less energy than aerobic respiration but does it much faster.
      • EPOC (Excess post-exercise oxygen consumption)
        • During this time the lactic acid reacts with oxygen to form carbon dioxide and water, and releases the rest of the energy orignially in the glucose.
      • Fermentation (yeast)
        • glucose -> ethanol + carbon dioxide
        • Yeast undergoes fermentation when bread and beer are made.
          • Ethanol is the alcohol produced.
            • It is evaportaed away when bread is baked
              • CO2 is trapped, causing the bread to rise and gives beer its bubbles.


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