Exercise

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

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

  Because exercise requires moving muscles more than usual.
• What does muscular contraction require?

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

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

  It requires more energy to move the muscles around the lungs.
• What happens to the heart rate during exercise?

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

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

  Cells start using anaerobic respiration.
• How does anaerobic respiration compare to aerobic respiration?

  Anaerobic respiration is far less efficient than aerobic respiration.
• What is a 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 for the oxygen needed to repay lactic acid buildup?

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

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

  Questions involving measuring things before and after exercise.
• What changes might be described or explained in exercise-related questions?

  • Changes in breathing rate
  • Changes in heart rate