Cellular Respiration in Muscle Cells during various levels of physical activity

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  • Created by: rebecccab
  • Created on: 14-05-16 14:06
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  • Cellular Respiration in Muscles during Physical Activity
    • muscle cells will respire aerobically whilst the oxygen supply is adequate
      • e.g: walking requires little energy so it will be supplied aerobically
      • intense sporting activity
        • such as: 100m sprint
          • can quickly increase the level of oxygen required causing the depth and frequency of breathing and heart rate to increase
        • can quickly increase the level of oxygen required causing the depth and frequency of breathing and heart rate to increase
    • carbon dioxide will build up
      • which will increase the acidity of the muscle cells
        • before it is removed by the circulatory system
    • as exercise continues...
      • oxygen levels in the blood will decrease
      • carbon dioxide levels will increase
    • if oxygen can't be supplied quick enough...
      • cells will respire anaerobically
        • causing a build up of lactic acid
          • inside muscle cells
          • in the blood
          • a build up of lactic acid can cause...
            • muscle fatigue
            • cramps
    • to avoid damage to cells...
      • lactic acid has to be broken down to...
        • carbon dioxide and water
          • immediately after exercise has finished
            • requires oxygen
              • extra oxygen needed is called oxygen debt
                • body continues to breathe deeply for some time
                  • after vigorous exercise has finished
                • oxygen debt is paid back only after all lactic acid has broken down
  • causing a build up of lactic acid
    • inside muscle cells
    • in the blood
    • a build up of lactic acid can cause...
      • muscle fatigue
      • cramps
  • extra oxygen needed is called oxygen debt
    • body continues to breathe deeply for some time
      • after vigorous exercise has finished
    • oxygen debt is paid back only after all lactic acid has broken down

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