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5 Written questions

5 Matching questions

  1. In working myoctes, phase 0 of AP is rapid depol caused by ___
  2. Incr preload causes ___ SV. It is manifest as incr EDV.
  3. According to the Frank-Starling principle, incr in EDV will cause an incr in ventricular fiber length, leading to ___
  4. In nodal pacing myocytes, phase 1 of AP is ___.
  5. In working myoctes, phase 3 of AP is rapid repol caused by ___.
  1. a incr dev't tension
  2. b incr
  3. c • 1º incr K+ out
    • decr Ca2+ in
  4. d I(Na)
  5. e absent

5 Multiple choice questions

  1. decr
  2. • neg chronotropy
    • neg dromotropy
    • decr atrial inotropy
  3. • I(f)- inward Na+
  4. Norepi
  5. absent

5 True/False questions

  1. Neg chronotropy reduces HR by ___.decr rt of phase 4 depol in pacemaker cells


  2. In working myoctes, phase 1 of AP is initial repol caused by ___.• I(to)- transient K+ out
    • decr I(Na)


  3. Norepi incr inward Ca2+ during plateau via beta-1 receptors. It also incr SR Ca2+ pump activity by ___, which incr Ca2+ in SR.Norepi


  4. I(f) is turned on by ___.repol of memb potential in preceding AP.


  5. Decr phase 4 rt in pacemaker cells is caused by ___decr rt of phase 4 depol in pacemaker cells


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