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5 Written questions

5 Matching questions

  1. Digitalis has a pos inotropic effect. It causes incr [Ca2+](intracel) by ___.
  2. Decr phase 4 rt in pacemaker cells is caused by ___
  3. In nodal pacing myocytes, phase 4 is slow repol (diastolic depol) caused by ___.
  4. In working myoctes, phase 1 of AP is initial repol caused by ___.
  5. In working myoctes, phase 4 of AP is resting membrane potential maintained by ___.
  1. a diminishing Na+ gradient, which diminishes Na+-Ca2+ exchange
  2. b I(K1)
  3. c • I(to)- transient K+ out
    • decr I(Na)
  4. d • I(f)- inward Na+
  5. e decr I(f)- the inward Na+

5 Multiple choice questions

  1. ACh, muscarinic
  2. incr dev't tension
  3. • incr K+ conductance- outward
  4. • transient incr I(Ca2+)- inward
    • incr K+ out
  5. • positive chronotropy
    • pos dromotropy
    • pos inotropy

5 True/False questions

  1. In nodal pacing myocytes, phase 1 of AP is ___.• incr Ca2+ conductance- inward
    • note that this is different; I(Na) in working myocytes

          

  2. Digitalis has a pos inotropic effect. It inhibits ___ on the myocardial cell membrane.Na+, K+ -ATPase (causing incr [Na+](intracel))

          

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

          

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

          

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

          

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