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 not need a great deal of energy when relaxing?

  Because we are not moving
• What happens to energy demand during exercise?

  It increases significantly for muscle contraction
• How does aerobic respiration change during exercise?

  It increases to meet energy demands
• What physiological changes occur to supply more oxygen during exercise?

  Breathing rate and volume increase
• What happens to the heart rate during exercise?

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

  Not enough oxygen can be supplied to muscles
• What occurs when there is insufficient oxygen during exercise?

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

  Lactic acid is produced in the muscles
• What effect does lactic acid have on muscles during vigorous activity?

  It causes muscle fatigue and inefficient contraction
• What must the body do with lactic acid after exercise?

  Remove it from the muscles
• What is the condition called when lactic acid accumulates in the muscles?

  Oxygen debt
• How is lactic acid transported after exercise?

  By the blood to the liver
• What happens to lactic acid in the liver?

  It is converted back to glucose
• Why does the body need extra oxygen after exercise?

  To deal with accumulated lactic acid
• Why do people continue breathing 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 energy supply
  • Breathing rate and volume increase for oxygen
  • Heart rate increases to pump oxygenated blood
  • Anaerobic respiration occurs if oxygen is insufficient
  • Lactic acid builds up, causing fatigue
  • Oxygen debt is created from lactic acid removal
• What is oxygen debt and its significance?

  • Oxygen debt is the extra oxygen needed post-exercise
  • Required to convert lactic acid back to glucose
  • Explains why breathing remains rapid after exercise