Biology- 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
• Body's reaction to increased energy demand during exercise

  1. Aerobic respiration increases

  2. Breathing rate and volume increase

  3. Heart rate increases
• When oxygen supply is insufficient during exercise

  Anaerobic respiration takes place in the muscles
• Anaerobic respiration


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

  Causes muscle fatigue and inefficient muscle contraction
• Removing lactic acid from muscles after exercise

  1. Lactic acid transported to liver

  2. Converted back to glucose

  3. Requires oxygen
• Oxygen debt


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