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5 Written questions

5 Matching questions

  1. PS vagal innervation uses the NT ___ on ___ receptors.
  2. PS (ACh) via muscarinic receptors decr atrial contractility by ___.
  3. According to the Frank-Starling principle, incr in EDV will cause an incr in ventricular fiber length, leading to ___
  4. In nodal pacing myocytes, phase 4 is slow repol (diastolic depol) caused by ___.
  5. Neg chronotropy reduces HR by ___.
  1. a incr dev't tension
  2. b decr rt of phase 4 depol in pacemaker cells
  3. c decr inward Ca2+ current in plateau
  4. d ACh, muscarinic
  5. e • I(f)- inward Na+

5 Multiple choice questions

  1. EDV/RAP and CO/SV
  2. • neg chronotropy
    • neg dromotropy
    • decr atrial inotropy
  3. decr
  4. phosphorylation of phospholamban
  5. • transient incr I(Ca2+)- inward
    • incr K+ out

5 True/False questions

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


  2. In working myoctes, phase 4 of AP is resting membrane potential maintained by ___.I(K1)


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


  4. Beta-1 receptor activation causes ___ in the CV system.• positive chronotropy
    • pos dromotropy
    • pos inotropy


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