4.2.2 Response to Exercise

• What is meant by the term oxygen debt?

  The amount of extra oxygen the body needs after exercise to react with the accumulated lactic acid and remove it from the cells.
• Why does breathing increase during exercise?

  To get more oxygen into the blood.
• Why does heart rate increase during exercise?

  To pump oxygenated blood faster.
• When does anaerobic respiration take place in muscles?

  During intense exercise or when there is insufficient oxygen supply.
• What happens during long periods of vigorous activity?

  Muscles become fatigued and stop contracting efficiently.
• Where does the blood flowing through the muscles transport the lactic acid to and why?

  The liver to be converted back into glucose.
• What 3 things increase during exercise?

  Heart rate, breathing rate and breath volume.
• What is there an increased demand for during exercise?

  Energy.
• What is a build up of lactic acid a result of?

  The incomplete oxidation of glucose.