Respiration and Exercise

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  • Created by: Sophie
  • Created on: 27-04-13 10:05

Respiration basics

  • involves reactions catalysed by enzymes 
  • releases the energy the cells need to do everything 
  • process of releasing energy from the breakdown of glucose which goes on in every cell
  • releases energy to..
    • build large molecules from small ones-proteins from amino acids 
    • allow muscle to contract (animals) 
    • keep body temperature steady (mammals) 
    • turn sugars, nitrates and other nutrients into amino acids for making protiens (plants)
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Aerobic Respiration

·   'in the presence of oxygen'

·    efficient way to release energy from glucose 

·    goes on all the time 

·     happens inside mitochondria


·  Glucose -------> carbon dioxide + water (+ energy) 

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Anaerobic Respiration

  • 'without oxygen' 
  • vigorous exercise- body cant get enough oxygen for aerobic respiration 
  • incomplete breakdown of glucose, produces lactic acid 
  • lactic acid causes pain in muscles & muscle fatigue 
  • not as much energy as aerobic 
  • oxygen debt- repay the oxygen that your muscles didn't get, break down the lactic acid 
  • keep breathing heavily after you stop exercising to pay back debt 
  • Glucose ----------> lactic acid (+ energy) 
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Exercise basics

  • muscle cells use oxygen to release energy from glucose which is used to contract muscles 
  • physical activity...
    • increases breathing rate- to meet demand for oxygen 
    • increases heart rate- to pump the blood quicker to get the oxygen to the muscle cells
  • some glucose- stored as glycogen
  • each muscle cell has it own store 
  • during exercise-glycogen converted back to glucose to provide more energy 
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