Exercise & Oxygen Debt

• What is the main focus of the video regarding exercise?

  The video explores how exercise affects the human body.
• Why do our bodies need to carry out more respiration during exercise?

  Because exercise requires us to move our muscles more than usual.
• What does muscular contraction require?

  A lot of energy from respiration.
• What must increase to supply enough oxygen to our muscles during exercise?

  The rate of our breathing and the volume of each breath.
• What is the downside of increased breathing during exercise?

  It requires us to move the muscles around our lungs more than usual, which needs energy.
• What happens to our heart rate during exercise?

  Our heart rate increases to pump oxygen around the body more quickly.
• What is the purpose of the increased effort during exercise?

  To supply enough oxygen to all of our muscles for aerobic respiration.
• What happens when there is not enough oxygen during intense exercise?

  Our cells will start using anaerobic respiration.
• How does anaerobic respiration compare to aerobic respiration?

  Anaerobic respiration is far less efficient than aerobic respiration.
• What is a major byproduct of anaerobic respiration?

  Lactic acid.
• What sensation does lactic acid buildup cause in muscles?

  A burning sensation.
• What must the body do after exercising to deal with lactic acid?

  React lactic acid with oxygen to get rid of it.
• What is the term used for the oxygen needed to repay lactic acid buildup?

  Oxygen debt.
• Where does the blood carry lactic acid after exercise?

  From the muscles to the liver.
• What happens to lactic acid in the liver?

  It reacts with oxygen and is converted back to glucose.
• What are the two main things we can measure to investigate the effects of exercise on the body?

  • Breathing rate
  • Heart rate
• How do you measure someone's breathing rate?

  Count how many times their chest rises and falls in one minute.
• How can you measure heart rate?

  By measuring your pulse on an artery in your wrist or neck.
• What type of questions might be asked around the topic of exercise effects?

  Questions involving measuring things before and after exercise and explaining changes.
• What are the key physiological changes during exercise?

  • Increased breathing rate and volume
  • Increased heart rate
  • Increased energy demand for muscle contractions
  • Shift from aerobic to anaerobic respiration when oxygen is insufficient
  • Lactic acid buildup and oxygen debt