Advanced Dysrhythmias Questions And Answers Allverified

Advanced - Dysrhythmias - Questions And Answers - All VerifiedExcitability Correct ans - the ability of non-pacemaker heart cells to respond to an electrical impulse that begins in pacemaker cells.Depolarization Correct ans - occurs when the normally negatively charged cells within the heart muscle develop a positive charge.Conductivity Correct ans - the ability to send an electrical stimulus from cell membrane to cell membrane. As a result, excitable cells depolarize in rapid succession from cell to cell until all cells have depolarized. Ex: the wave of depolarization causes the deflections in the ECG waveforms that are recognized as the P wave and QRS complex.Contractility Correct ans - the ability of atrial and ventricular muscle cells to shorten their fiber length in response to electrical stimulation, causing sufficient pressure to push blood forward through the heart. In other words, this is the mechanical activity of the heart.AV Node Correct ans - where impulses slow down or are delayed before proceeding to the ventricles. This delay is reflected in the PR segmenton the ECG. This slow conduction provides a short delay, allowing the atria tocontract and the ventricles to fill.SA Node Correct ans - the heart's primary pacemaker. It can spontaneously and