Exercise

• What is the primary 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 aerobic respiration change during exercise?

  It increases to meet energy demands
• What happens to the breathing rate during exercise?

  It increases to supply more oxygen
• What is the effect of exercise on heart rate?

  Heart rate increases to pump blood
• What problem can occur when exercising hard?

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

  Incomplete oxidation of glucose occurs
• What chemical builds up in muscles during anaerobic respiration?

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

  It causes muscle fatigue and inefficiency
• What is oxygen debt?

  Extra oxygen needed to remove lactic acid
• How is lactic acid removed from muscles?

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

  It is converted back to glucose
• Why do people breathe rapidly after exercise?

  To supply oxygen for lactic acid removal
• What happens in the body during exercise?

  • Increased energy demand for muscle contraction
  • Aerobic respiration increases for more oxygen
  • Breathing rate and volume increase
  • Heart rate increases to pump oxygenated blood
  • Anaerobic respiration occurs if oxygen is insufficient
  • Lactic acid builds up, causing fatigue
• What are the key points about oxygen debt?

  • Oxygen debt is the extra oxygen needed post-exercise
  • It helps remove lactic acid from muscles
  • Lactic acid is transported to the liver
  • In the liver, lactic acid is converted back to glucose