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Anerobic and Aerobic Respiration

Anerobic Respiration:

Glucose ---> lactic acid [some energy] - sone but less

Lactic acid prevents muscles contracting, needs more oxygen as entered oxygen debt

massages help pump blood around the body, improves circulation


Aerobic Respiration:

Glucose + Oxygen ---> carbon dioxide + water [energy]


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We use energy for:

  • respiration
  • heat
  • movement of muscles
  • growth and repair for cell division
  • larger molecules converted to smaller molecules 
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Exercise increases heart rate.

Muscle cells use oxygen to release energy from glucose, which is used to contract the muscles. 

An increase in muscle activity needs more glucose and oxygen to be supplied and extra carbon dioxide needs to be removed, blood needs to flow at a faster rate.

Physical activity:

  • increases breathing rate, breathe more deeply as more oxygen is needed
  • increase the rate at which the heart pumps, as blood needs to get around the body faster 


  • glucose from food may be stored as glycogen 
  • glycogen is mainly stored in the liver 
  • during vigorous exercise, muscles use glucose fast, therefore some glycogen is converted back to glucose to provide extra energy
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