1. What does the P wave represent?
    • depolarization of the atria
    • contraction of the atria to push blood into the ventricles
  2. depolarization = _____.
  3. Why is the P wave short?
    because it doesn't take a lot of force to push blood into the ventricles
  4. Where does the P wave start?
    SA node
  5. An EKG traces the electrical activity of the heart, but does it also tell us about the mechanical activity of the heart?
  6. What does the P-R interval represent?
    represents the time required for an impulse to travel from the SA node to the ventricles
  7. What is important about the P-R interval?
    the impulse has to pass through the SA node, atria, and VA node and all of these ahve to be working properly in order for the blood to get to the ventricles
  8. On an EKG, height represents what?  Width represents what?
    • height:  amplitude
    • width:  time
  9. What does the QRS complex represent?
    depolarization of the ventricles
  10. Why is the QRS complex so big?
    because the heart is pushing the blood either to the lungs or to the whole body and have to go through tiny capillaries so it takes a lot of force from the heart
  11. What does the T wave represent?
    repolarization of the ventricles
  12. Does repolarization of the atria show up on the EKG?  Why or why not?
    no, it happens during the QRS complex and it is so small that it does not show up on the EKG
  13. What does repolariztion mean?
  14. What are the two types of paper speed?
    • 25 mm
    • 50 mm
  15. 25 mm = _____ sec.
    1 second
Card Set