Lab #5

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Lab #5
2012-03-17 23:36:10
Lab test

Anatomy and physiology 2
Show Answers:

  1. What is the S-A node stand for?
    Self stimulation
  2. True or false:
    The heart requires nerves to beat
  3. Ectopic beats
    irregular beating of the heart due to abnormal pacemaker
  4. Conduction through the heart are made possible by _____ junctions?
  5. Gap junctions are found in _____ of cardiac muscle.
    Intercalated discs
  6. What does EKG actually measure?
    Average voltage output of millions of cardiac cells.
  7. EKG
    Atrial depolarization
  8. EKG
    QRS complex=
    Ventricular depolarization
  9. EKG
    Ventricular repolarization
  10. EKG
    S-T line=
    refractory state of the ventricular myocardium.
  11. EKG
    P-Q line=
    nonconductive state of av during which atrial systole can be completed
  12. What happens during P in an EKG?
    Impulse travels from SA node throughout atria.
  13. What happens during PR interval in the EKG?
    impulse travels fromt the atria to bundle of his then to bundle branches of purkinje fibers.
  14. What happens in the T-wave in an EKG?
    repolarization of the ventricles and purkinje fibers
  15. ST line indicates what?
    end of ventricular depolarization and ventricular repolarization.
  16. Arrhythmias:
    Ventricular fibrillation
    Rapid uncoordinated depolarization of ventricles
  17. Arrhythmias:
    Rapid heartbeat
  18. Arrhythmias:
    Atrial flutter
    Rapid rate of atrial depolarization
  19. Bradycardia
    Slow beating heart
  20. Normal heart rate:
    _____ wave always follows a _____ wave.
    • P
    • QRS
  21. What happens to the EKG when there is damage to coronary circulation?
    • Waves may widen (contractions are slower) also wave shape changes.
    • ex. ST segment depression
  22. Distance between 2 QRS waves:
    Too close together
    Heart is beating too fast
  23. Distance between 2 QRS waves:
    Too far apart
    Heart beating too slow
  24. Blood pressure is measured with what ? SPELL IT!
  25. What is the 1rst Korotkoff sound
    Systolic pressure... artery has opened enough for blood to squiert through.
  26. What is the last Korotkoff sound?
    Diastolic pressure... artery completely opened; no more turbulance in blood.
  27. What is the Pulse pressure?
    • Systolic BP - Diastolic B
    • Actual working or driving pressure of the blood.