Exercise

• Why do our bodies need to carry out more respiration during exercise?

  To provide energy for muscle movement
• What does muscular contraction require?

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

  The rate and volume of breathing
• What is a 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 quickly
• What is the purpose of increased effort during exercise?

  To supply enough oxygen for aerobic respiration
• When does the body start using anaerobic respiration?

  When there isn't enough oxygen during intense exercise
• What is a major drawback of anaerobic respiration?

  It produces lactic acid
• What sensation does lactic acid buildup cause?

  A burning sensation in muscles
• What must the body do after exercise regarding lactic acid?

  React it with oxygen to remove it
• What is the term for the oxygen needed to remove lactic acid?

  Oxygen debt
• What happens to lactic acid after exercise?

  It is transported to the liver for conversion
• What can be measured to investigate the effects of exercise?

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

  Count chest rises and falls in one minute
• How can 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 the human body?

  • Increased respiration for energy
  • Higher breathing rate and volume
  • Increased heart rate for oxygen delivery
  • Possible shift to anaerobic respiration
  • Lactic acid buildup causing muscle burning
  • Oxygen debt to remove lactic acid
  • Measurement of breathing and heart rates