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5 Written questions

5 Matching questions

  1. Incr contractility cause ___ SV.
  2. In nodal pacing myocytes, phase 3 of AP is repolarization caused by ___.
  3. Digitalis has a pos inotropic effect. It causes incr [Ca2+](intracel) by ___.
  4. Beta-1 receptor activation causes ___ in the CV system.
  5. In working myoctes, phase 4 of AP is resting membrane potential maintained by ___.
  1. a • positive chronotropy
    • pos dromotropy
    • pos inotropy
  2. b incr
  3. c I(K1)
  4. d • incr K+ conductance- outward
  5. e diminishing Na+ gradient, which diminishes Na+-Ca2+ exchange

5 Multiple choice questions

  1. I(Na)
  2. • decr inward Ca2+ current
    • incr outward K+ current
  3. absent
  4. • I(to)- transient K+ out
    • decr I(Na)
  5. incr dev't tension

5 True/False questions

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


  2. In working myoctes, phase 2 of AP is plateau caused by ___.• transient incr I(Ca2+)- inward
    • incr K+ out


  3. PS (ACh) via muscarinic receptors decr atrial contractility by ___.decr inward Ca2+ current in plateau


  4. In nodal pacing myocytes, phase 1 of AP is ___.absent


  5. ___ is the NT that acts on beta-1 receptorsNorepi