Exercise

• What is the main purpose of respiration in humans?

  To provide energy for bodily functions
• What are the two types of respiration mentioned?

  Aerobic and anaerobic respiration
• Why does the body need more energy during exercise?

  For muscle contraction and increased activity
• How does the body respond to increased energy demand during exercise?

  By increasing aerobic respiration and oxygen intake
• What happens to the breathing rate during exercise?

  It increases to supply more oxygen
• What is the role of the heart during exercise?

  To pump oxygenated blood around the body
• What problem can occur when exercising hard?

  Not enough oxygen can reach the muscles
• What is produced during anaerobic respiration?

  Lactic acid
• What effect does lactic acid have on muscles?

  It causes muscle fatigue and inefficiency
• What is the condition called when lactic acid accumulates in muscles?

  Oxygen debt
• How is lactic acid removed from the muscles?

  It is transported out by the blood
• Where is lactic acid taken after being transported out of the muscles?

  To the liver for conversion back to glucose
• Why does the body continue to breathe rapidly after exercise?

  To supply extra oxygen needed to remove lactic acid
• What happens in the body during exercise?

  • Increased energy demand for muscle contraction
  • Increased aerobic respiration
  • Increased breathing rate and volume
  • Increased heart rate to pump oxygenated blood
  • Possible shift to anaerobic respiration if oxygen is insufficient
  • Lactic acid buildup leading to muscle fatigue
• What is oxygen debt and its significance?

  • Oxygen debt is the extra oxygen needed after exercise
  • Required to remove lactic acid from muscles
  • Causes continued rapid breathing post-exercise