Exercise

• Respiration


  The process that releases 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
• Sometimes not enough oxygen can be supplied to the muscles, especially during hard exercise
• What happens when there is not enough oxygen


  1. Anaerobic respiration takes place in the muscles

  2. Oxidation of glucose is incomplete

  3. Lactic acid builds up
• Lactic acid buildup during long periods of vigorous activity


  Causes muscle fatigue and inefficient muscle contraction
• Oxygen debt


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


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

  2. Lactic acid is taken to the liver

  3. Lactic acid is converted back to glucose
• Reacting with and removing the accumulated lactic acid requires oxygen