4.4 - Exercise

• How can we investigate the effects of exercise on the body?

  Breathing rate

  Heart rate
• 1. In order to move during exercise, we have to contract and relax our muscles
  2. Muscular contraction requires energy though, which has to be released by cellular respiration.
  3. Most of the time cells carry out aerobic respiration, which is far more efficient but requires oxygen
  4. This means we have to pump oxygen around the body faster when we exercise. As a result we increase both our heart rate and breathing rate.
• Which organ in the body removes the lactic acid from the blood?

  Liver