Nursing 213-Dysrhythmias Exam Questions with 100% Correct Answers

Automaticity Correct Answer (pacing function) is the ability of cardiac cells to generate an electrical impulse spontaneously and repetitively. Excitability Correct Answer the ability of non-pacemaker heart cells to respond to an electrical impulse that begins in pacemaker cells and depolarize Conductivity Correct Answer ability to send an electrical stimulus from cell membrane to cell membrane. Contractility Correct Answer 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 it is the *mechanical activity of the heart* SA Node Correct Answer The hearts primary pacemaker Normal cardiac impulse begins here *Represents the P-wave* on EKG *60-100 bpm* AV node Correct Answer If SA node fails, this kicks in Slows conduction provides a short delay, allowing the atria to contract and the ventricles to fill. this contraction is know as *atrial kick* *Represents the PR Segment* on EKG *40- 60 bpm* Nervous System Control of the heart : *Parasympathetic Nervous System* Correct Answer Vagus Nerve Slows everything down Bundle of his Right and left bundle branches Purkinje fibers Correct Answer Connects the atria & ventricles electricity