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5 Written questions

5 Matching questions

  1. In working myoctes, phase 4 of AP is resting membrane potential maintained by ___.
  2. In working myoctes, phase 3 of AP is rapid repol caused by ___.
  3. Muscarinic receptor activation causes ___ in the CV system.
  4. Digitalis has a pos inotropic effect. It inhibits ___ on the myocardial cell membrane.
  5. In nodal pacing myocytes, phase 1 of AP is ___.
  1. a absent
  2. b • neg chronotropy
    • neg dromotropy
    • decr atrial inotropy
  3. c Na+, K+ -ATPase (causing incr [Na+](intracel))
  4. d • 1º incr K+ out
    • decr Ca2+ in
  5. e I(K1)

5 Multiple choice questions

  1. Norepi
  2. incr
  3. absent
  4. I(Na)
  5. vagal

5 True/False questions

  1. Digitalis has a pos inotropic effect. It causes incr [Ca2+](intracel) by ___.Na+, K+ -ATPase (causing incr [Na+](intracel))

          

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

          

  3. Neg dromotropy reduces AV nodal conduction velocity by ___decr rt of phase 4 depol in pacemaker cells

          

  4. In nodal pacing myocytes, phase 3 of AP is repolarization caused by ___.• incr Ca2+ conductance- inward
    • note that this is different; I(Na) in working myocytes

          

  5. PS (ACh) via muscarinic receptors decr atrial contractility by ___.• neg chronotropy
    • neg dromotropy
    • decr atrial inotropy

          

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