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5 Written questions

5 Matching questions

  1. In working myoctes, phase 3 of AP is rapid repol caused by ___.
  2. Beta-1 receptor activation causes ___ in the CV system.
  3. Incr preload causes ___ SV. It is manifest as incr EDV.
  4. In working myoctes, phase 1 of AP is initial repol caused by ___.
  5. Digitalis has a pos inotropic effect. It inhibits ___ on the myocardial cell membrane.
  1. a Na+, K+ -ATPase (causing incr [Na+](intracel))
  2. b • positive chronotropy
    • pos dromotropy
    • pos inotropy
  3. c • I(to)- transient K+ out
    • decr I(Na)
  4. d • 1º incr K+ out
    • decr Ca2+ in
  5. e incr

5 Multiple choice questions

  1. • decr inward Ca2+ current
    • incr outward K+ current
  2. • incr Ca2+ conductance- inward
    • note that this is different; I(Na) in working myocytes
  3. absent
  4. • transient incr I(Ca2+)- inward
    • incr K+ out
  5. I(K1)

5 True/False questions

  1. 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

          

  2. Muscarinic receptor activation causes ___ in the CV system.• neg chronotropy
    • neg dromotropy
    • decr atrial inotropy

          

  3. Incr afterload causes ___ SV. It is manifest as incr aortic presdecr

          

  4. Alpha-1 receptor activation causes ___ In the CV system.skin, splanchnic, and skeletal vascular smooth muscle constriction

          

  5. Incr contractility cause ___ SV.repol of memb potential in preceding AP.