exercise

• What is the primary purpose of respiration in humans?

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

  Aerobic and anaerobic respiration
• Why do we 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 breathing rate and volume during exercise?

  Both increase to supply more oxygen
• What happens to heart rate during exercise?

  It increases to pump oxygenated blood
• What problem can occur when exercising hard?

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

  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 the condition called when lactic acid accumulates in muscles?

  Oxygen debt
• How is lactic acid removed from 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 to glucose
• What is required to react with and remove lactic acid?

  Oxygen
• What does oxygen debt represent?

  The extra oxygen needed after exercise
• Why do people continue to 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 is the process of lactic acid removal after exercise?

  1. Lactic acid transported out of muscles by blood
  2. Taken to the liver
  3. Converted back to glucose
  4. Requires oxygen for the conversion
  5. Oxygen debt is created