Exercise increases the heart rate

  • Muscle cells use oxygen to release energy from glucose, which is then used to contract the muscles
  • More muscle activity requires more glucose and oxygen to be supplied. Extra carbon dioxide needs to be removes. This means that blood needs to flow at a faster rate

Physical activity

  • increases your breathing rate
  • makes you breate deeper to meet demands for extra oxygen
  • increases the speed at which the heart pumps

Glycogen is used during exercise

  • Some glucose from food is stored as glycogen
  • Stored in the liver
  • Glycogen is converted back to glucose during heavier exercise to provide more energy
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