Exercise

Exercise

1. Exercise increases the heart rate

   • Muscles are made of muscle cells
     • These use oxygen to release energy from glucose
       • (Aerobic respiration)
       • Used to contract the muscles
   • Increase in exercise requires more glucose and oxygen
     • To supplied the muscle cells
     • Extra carbon dioxide needs to be removed
       • Blood flows at a faster rate
   • Physical activity:
     • increase your breathing rate
       • makes you breathe more deeply to meet the demand for extraoxygen
     • Increases the speed at which the heart pumps

2. Glycogen is used during exercise

   • Glucose from food is stores as glycogen
   • Glycogen is mainly stored in the liver
     • But each muscles also has its own store
   • During vigorous exercise, glucose it being used rapidly
     • Some of the store glycogen gets converted back to glucose
       • Produces more energy

3. Anaerobic Respiration

   • Used if there note enough oxygen
   • If your body can't get enough oxygen during vigorous exercise
     • Your muscles start doing anaerobic respiration instead of aerobic respiration
   • "Anaerobic" means WITHOUT oxygen
   • An incomplete breakdown of glucose
     • Produces lactic acid as waste product

4. Anaerobic Respiration leads to an oxygen debt

   • An oxygen debt is when you body "repays" the oxygen that couldn't get to your mucsles in time
     • Because you lungs, heart and blood couldn't keep up with the demand earlier on

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