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5 Written questions

5 Matching questions

  1. Incr contractility cause ___ SV.
  2. I(f) is turned on by ___.
  3. In working myoctes, phase 2 of AP is plateau caused by ___.
  4. In nodal pacing myocytes, phase 2 of AP is ___.
  5. In nodal pacing myocytes, phase 0 of AP is upstroke caused by ___
  1. a • transient incr I(Ca2+)- inward
    • incr K+ out
  2. b incr
  3. c repol of memb potential in preceding AP.
  4. d • incr Ca2+ conductance- inward
    • note that this is different; I(Na) in working myocytes
  5. e absent

5 Multiple choice questions

  1. • positive chronotropy
    • pos dromotropy
    • pos inotropy
  2. decr inward Ca2+ current in plateau
  3. • incr K+ conductance- outward
  4. decr
  5. incr

5 True/False questions

  1. Parasympathetic ___ innervation is found in the SA, artia, and AV.ACh, muscarinic


  2. PS vagal innervation uses the NT ___ on ___ receptors.ACh, muscarinic


  3. According to the Frank-Starling principle, incr in EDV will cause an incr in ventricular fiber length, leading to ___incr dev't tension


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


  5. ___ is the NT that acts on beta-1 receptorsrepol of memb potential in preceding AP.