Exercise

• What is the main focus of the video?

  How exercise affects the human body
• Why does exercise increase the need for respiration?

  Exercise requires more energy for muscle movement
• What happens to breathing rate during exercise?

  It increases to supply more oxygen
• How does increased breathing affect muscle energy during exercise?

  It provides more oxygen for aerobic respiration
• What is the downside of increased breathing during exercise?

  It requires more energy to move lung muscles
• What happens to heart rate during exercise?

  It increases to pump oxygen more quickly
• What is the purpose of increased heart rate during exercise?

  To supply enough oxygen to muscles
• What type of respiration do muscles use when oxygen is insufficient?

  Anaerobic respiration
• Why is anaerobic respiration less efficient?

  It produces less energy than aerobic respiration
• What is a byproduct of anaerobic respiration?

  Lactic acid
• What sensation does lactic acid buildup cause?

  Burning sensation in muscles
• What is oxygen debt?

  The need to repay oxygen after exercise
• How is lactic acid removed from muscles?

  By reacting it with oxygen in the liver
• What does blood do with lactic acid after exercise?

  Carries it to the liver
• What can be measured to investigate exercise effects?

  Breathing rate and heart rate
• How do you measure breathing rate?

  Count chest rises and falls in one minute
• How do you measure heart rate?

  By measuring pulse on wrist or neck
• What type of questions might be asked about exercise effects?

  Measuring changes before and after exercise
• What are the effects of exercise on respiration and circulation?

  • Increased respiration for energy
  • Increased breathing rate for oxygen
  • Increased heart rate for oxygen delivery
  • Anaerobic respiration when oxygen is low
  • Lactic acid buildup from anaerobic respiration
• What are the steps to remove lactic acid after exercise?

  1. Blood carries lactic acid to the liver
  2. Lactic acid reacts with oxygen
  3. Converted back to glucose
  4. Oxygen debt is repaid