Exam II Vocab

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  1. HCN channels
    Hyperpolarization cyclic nucleotide

  2. ectopic
    pacemaker setting rhythem that's much slower
  3. Myocardial action potential
    Once another myocardial cell has been stimulated by actional potential originated in the SA, it produces it's own action potential
  4. Ventricular fibrillation
    If the refractory period weren't as long (due to the Ca+ plateau), the myocardial cell can be stimulated a second time before they completed their first contraction

    There would have been zero output otherwise
  5. So potential shorter refractory period would cause ventricular fibrillation

    And potential faster action potential (like 1,2 msec), summation would occur
  6. 3 types of muscles
    • smooth
    • cardiac
    • skeletal
  7. 4 types of tissues
    • epithelial tissues
    • connective tissues
    • nervous tissues
    • muscle tissues
  8. Why is lost of control of the atria not as bad as lost of control of the ventricles?
    Because 70% of the blood move without the atrium even contracting
  9. Infarcted heart
    • Tissue death caused by local lack of oxygen due to obstruction
    • -Cause slower waves, because action potentials can't travel through
  10. Increase heart rate and blood pressure will cause enlargement of which cardial department?
    Left ventricle
  11. Ischemia
    • When the oxygen supply is deficient because of inadequent blood flow
    • Associated with increased concentration of blood lactic acid by anaerobic metabolism
  12. Bardycardia
    a cardiac rate slower than 60 beat/minute
  13. Tachycardia
    A cardiac rate faster than 100 beats/ minute
  14. MAP
    Mean Arterial Pressure: It is defined as the average arterial pressure during a singlecardiac cycle.
  15. Systolic/Diastolic peak: 120/80
    On the right side of the heart 25/8 (systolic/diastolic)
  16. Ejection fraction
    • Cardiac output
    • -The amount pushed out by the left ventricle into aorta and the circulation
  17. QRS wave
    Represents the depolarization of the ventricles, happens at the beginning of systole;

    As the pressure in ventricle builds up, the AV valves shut
  18. T wave
    • T wave represents repoloarization of the ventricles, happens at the beginning of diastole;
    • As the ventricle relaxes, its pressure decreases, the semilunar valve shuts to prevent backflow
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Exam II Vocab
2012-04-03 12:10:13
Exam II Physio Vocab

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