Exercise

• Exercise

  Requires increased aerobic respiration in the body
• Increased aerobic respiration during exercise

  1. Muscles require more energy

  2. Oxygen demand increases

  3. Breathing rate and volume increase

  4. Heart rate increases
• Insufficient oxygen during intense exercise

  Cells switch to anaerobic respiration
• Anaerobic respiration

  Less efficient than aerobic respiration, produces lactic acid
• Lactic acid buildup during exercise

  Causes a burning sensation in muscles
• Removing lactic acid after exercise

  1. Lactic acid carried to liver

  2. Reacted with oxygen

  3. Converted back to glucose
• Oxygen debt

  Extra oxygen needed to remove lactic acid after exercise
• Measuring effects of exercise

  1. Measure breathing rate

  2. Measure heart rate
• Breathing rate measured by counting chest rises and falls per minute
• Heart rate measured by feeling pulse on wrist or neck