- to be able to exercise the muscles of the body requires energy
- this is supplied by respiration
glucose + oxygen ---> releases large amount of energy + carbon dioxide + water.
- the more exercise being done, the more oxygen and glucose the cells will need.
- therefore a number of changes take place-
1) heart rate increases
2) rate and depth of breathing increases
3) arteries suppling muscles dilate
- these changes increase blood flow - therefore increasing supply of glucose and oxygen.
- also increases the rate of removal of carbon dioxide.
- muscles contain glycogen stores, is this a form of carbohydrate - which can be rapidly converted to glucose and is used during exercise.