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5 Written questions

4 Matching questions

  1. Digitalis has a pos inotropic effect. It inhibits ___ on the myocardial cell membrane.
  2. Parasympathetic ___ innervation is found in the SA, artia, and AV.
  3. In nodal pacing myocytes, phase 1 of AP is ___.
  4. In nodal pacing myocytes, phase 4 is slow repol (diastolic depol) caused by ___.
  1. a absent
  2. b Na+, K+ -ATPase (causing incr [Na+](intracel))
  3. c vagal
  4. d • I(f)- inward Na+

5 Multiple choice questions

  1. skin, splanchnic, and skeletal vascular smooth muscle constriction
  2. phosphorylation of phospholamban
  3. decr inward Ca2+ current in plateau
  4. • incr Ca2+ conductance- inward
    • note that this is different; I(Na) in working myocytes
  5. • I(to)- transient K+ out
    • decr I(Na)

5 True/False questions

  1. I(f) is turned on by ___.repol of memb potential in preceding AP.


  2. In working myoctes, phase 3 of AP is rapid repol caused by ___.I(Na)


  3. Decr phase 4 rt in pacemaker cells is caused by ___decr I(f)- the inward Na+


  4. PS vagal innervation uses the NT ___ on ___ receptors.Norepi


  5. In working myoctes, phase 2 of AP is plateau caused by ___.• 1º incr K+ out
    • decr Ca2+ in


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