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
• 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 to the liver by the blood

  2. Lactic acid is converted back to glucose through a series of chemical reactions

  3. Reacting with and removing the accumulated lactic acid requires oxygen