Energy from respiration

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  • Created by: Moodymoo
  • Created on: 08-03-14 17:24
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  • Energy from Respiration
    • Aerobic respiration
      • Oxygen + Glucose --> carbon dioxide + water +(energy)
      • Takes place in cells
      • Function is to provide cells with glucose and oxygen
      • Mitochondria
        • Most reactions take place here
        • They have a folded inner membrane to provide a large surface area
      • Reasons for respiration
        • Releases energy from our food so cells can use it
        • To build up large molecules from smaller ones to make new cell material
        • To make muscles contract
        • To keep body at a constant temperature
    • Responses to exercise
      • Muscles start contracting harder and faster, so need more oxygen and glucosse
      • Muscles also produce more carbon dioxide which needs to be removed
      • Heart rate increases and arteries supplying blood to muscles dilate, increase blood flow
        • This then increases supply of oxygen and glucose to muscles
      • Breathing rate increases and you breathe more deeply so more oxygen is brought into your body
    • Anaerobic respiration
      • Respiration without oxygen - glucose is incompletely broken down to form lactic acid
      • Less energy is released than aerobic respiration
      • After exercising you continue to puff and pant, the length of time depends how fit you are
        • You need to get rid of the waste lactic acid, which requires oxygen
        • The amount of oxygen you need to break the lactic acid into carbon dioxide and water is called the oxygen debt
        • Lactic acid + oxygen --> carbon dioxide +water


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