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5 Written questions

5 Matching questions

  1. PS (ACh) via muscarinic receptors decr atrial contractility by ___.
  2. In working myoctes, phase 1 of AP is initial repol caused by ___.
  3. In other words, Frank-Starling describes a proportional relationship between ___
  4. In nodal pacing myocytes, phase 2 of AP is ___.
  5. Muscarinic receptor activation causes ___ in the CV system.
  1. a • I(to)- transient K+ out
    • decr I(Na)
  2. b EDV/RAP and CO/SV
  3. c • neg chronotropy
    • neg dromotropy
    • decr atrial inotropy
  4. d decr inward Ca2+ current in plateau
  5. e absent

5 Multiple choice questions

  1. Na+, K+ -ATPase (causing incr [Na+](intracel))
  2. I(K1)
  3. Norepi
  4. phosphorylation of phospholamban
  5. • incr Ca2+ conductance- inward
    • note that this is different; I(Na) in working myocytes

5 True/False questions

  1. In working myoctes, phase 0 of AP is rapid depol caused by ___• 1º incr K+ out
    • decr Ca2+ in

          

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

          

  3. Incr contractility cause ___ SV.incr

          

  4. Neg chronotropy reduces HR by ___.decr rt of phase 4 depol in pacemaker cells

          

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