Excercise/ oxygen debt

• What happens when you exercise?

  Your muscles contract- body needs more cellular respiration- oxygen and energy
• Why does exercise need energy?

  • Muscle contraction- movement- energy
  • Breathing faster- more muscles working around lungs- energy
  • More blood needs to pumped around body quicker- faster heart rate- energy
• What type of respiration might have to be used in exercise if not enough oxygen is available?


  Anaerobic- helps release some energy withought using oxygen
• What are the down sides to anaerobic respiration?

  Lactic acid build up- burning sensation
• What is a solution to using anaerobic respiration?

  The blood can carry the lactic acid to the liver- acid will react with oxygen- gluclose- produce energy
• What may you get asked to calculate?


  heart rate or breathing rate