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  • Created by: Abbie
  • Created on: 09-05-12 19:10


Muscles are made of muscle cells - use oxygen to release energy from glucose (respiration) which is used to contract the muscles

An increase in muscle activity needs more glucose and oxygen, extra carbon dioxide needs to be removed - blood has to flow faster

Physical activity

  • Increases your breathing rate and makes you breathe more deeply for more oxygen
  • Increases the speed at which your heart pumps
  • Dilates arteries which supply blood to the muscles


  • Some glucose from food is stored as glycogen
  • Mainly stored in liver but each muscle has its own store
  • During vigorous exercise muscles use glucose rapidly and have to use glycogen…


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