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5 Written Questions

5 Matching Questions

  1. Incr contractility cause ___ SV.
  2. In nodal pacing myocytes, phase 0 of AP is upstroke caused by ___
  3. Norepi incr inward Ca2+ during plateau via beta-1 receptors. It also incr SR Ca2+ pump activity by ___, which incr Ca2+ in SR.
  4. Neg chronotropy reduces HR by ___.
  5. According to the Frank-Starling principle, incr in EDV will cause an incr in ventricular fiber length, leading to ___
  1. a phosphorylation of phospholamban
  2. b • incr Ca2+ conductance- inward
    • note that this is different; I(Na) in working myocytes
  3. c decr rt of phase 4 depol in pacemaker cells
  4. d incr dev't tension
  5. e incr

5 Multiple Choice Questions

  1. absent
  2. EDV/RAP and CO/SV
  3. decr
  4. ACh, muscarinic
  5. skin, splanchnic, and skeletal vascular smooth muscle constriction

5 True/False Questions

  1. Digitalis has a pos inotropic effect. It causes incr [Ca2+](intracel) by ___.diminishing Na+ gradient, which diminishes Na+-Ca2+ exchange


  2. In nodal pacing myocytes, phase 4 is slow repol (diastolic depol) caused by ___.• incr K+ conductance- outward


  3. In working myoctes, phase 1 of AP is initial repol caused by ___.• 1º incr K+ out
    • decr Ca2+ in


  4. Incr preload causes ___ SV. It is manifest as incr EDV.decr


  5. Parasympathetic ___ innervation is found in the SA, artia, and AV.vagal


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