exercise

• What is the primary purpose of respiration in humans?

  To provide energy for movement, warmth, and chemical reactions
• 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 to meet increased energy demands
• How does the body respond to the increased demand for energy during exercise?

  By increasing aerobic respiration, breathing rate, and heart rate
• What happens to the breathing rate and volume during exercise?

  Both the breathing rate and volume increase
• 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 be supplied to the muscles
• What occurs when there is insufficient oxygen during exercise?

  Anaerobic respiration takes place in the muscles
• What is produced during anaerobic respiration?

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

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

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

  It is transported out by the blood to the liver
• 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 supply extra oxygen needed to remove accumulated 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
• What is oxygen debt and its significance?

  • Oxygen debt is the extra oxygen needed after exercise
  • It is required to remove lactic acid from muscles
  • Lactic acid is transported to the liver for conversion back to glucose