Exercise

• Respiration


  The process that provides energy for the body
• Types of respiration


  • Aerobic
  • Anaerobic
• When resting


  The body doesn't need a great deal of energy
• During exercise


  The body needs a great deal of energy for muscle contraction
• Aerobic respiration increases during exercise

  1. Breathing rate increases

  2. Breathing volume increases

  3. Heart rate increases

  4. More oxygen supplied to the bloodstream
• If not enough oxygen is supplied during exercise

  Anaerobic respiration takes place in the muscles
• Anaerobic respiration


  Oxidation of glucose is incomplete, leading to a buildup of lactic acid
• During long periods of vigorous activity

  Lactic acid causes the muscles to become fatigued and stop contracting efficiently
• Oxygen debt


  The amount of extra oxygen the body needs after exercise to deal with the accumulated lactic acid
• Removing lactic acid from the body

  1. Lactic acid is transported out of the muscles by the blood

  2. Lactic acid is taken to the liver and converted back to glucose
• Reacting with the accumulated lactic acid and removing it from the cells requires oxygen