Exercise

• What are the two types of respiration mentioned?

  Aerobic and anaerobic respiration
• Why do humans need energy?

  For movement, to keep warm, and for chemical reactions
• What happens to respiration during exercise?

  • Aerobic respiration increases
  • Body cells require more oxygen
  • Breathing rate and volume increase
  • Heart rate increases to pump oxygenated blood
• What happens to the body when it is relaxing?

  It does not need a great deal of energy
• What is the problem that occurs during intense exercise regarding oxygen supply?

  Not enough oxygen can be supplied to the muscles
• What is produced during anaerobic respiration?

  Lactic acid
• What effect does lactic acid have on muscles during prolonged vigorous activity?

  It causes muscles to become fatigued
• What is oxygen debt?

  • The amount of extra oxygen needed after exercise
  • Required to remove lactic acid from muscles
  • Causes continued rapid breathing after exercise
• How is lactic acid removed from the muscles?

  It is transported to the liver by blood
• What happens to lactic acid in the liver?

  It is converted back to glucose
• Why does the body continue to breathe rapidly after exercise?

  To deal with the accumulated lactic acid