Changing Levels of Performance

  1. Continuous or rapidly repeated contraction of muscles results in
    muscle fatigue
  2. Muscle fatigue results from a lack of ______ and a build up of ______ ____
    • oxygen
    • lactic acid
  3. During vigorous exercise muscles cannot get enough oxygen to enable them to break _______ down completely to __________ and water. Instead they respire anaerobically, breaking glucose down to ______ ____.
    • glucose
    • carbon dioxide
    • lactic acid
  4. As the levels of ______ ____ build up, the muscles become quickly fatigued.
    lactic acid
  5. During exercise both ______ rate and ______ breathing rate increase
    • pulse
    • breathing
  6. The breathing rate increases in order to get more ______ into the bloodstream.
  7. The pulse rate increases because the heart must beat _____ in order to deliver the blood to the muscles more quickly.
  8. ________ ____ is the time taken for the body to return to normal levels of pulse rate, breathing rate and lactic acid.
    Recovery time
  9. In athletes, during exercise the pulse rate, breathing rate and lactic acid level rise ____ than in an untrained person.
  10. After exercise the recovery time will be ____ for a fit person than for an unfit person. ________ ____ can be used as an indication of physical fitness.
    • less
    • recovery time
  11. Training improves the efficiency of the _____ and ________
    • lungs
    • circulation
  12. As a person trains, their fitness _________ and their recovery time after exercise _________
    • increases
    • decreases
Card Set
Changing Levels of Performance
Biology, The Body in Action, subtopic