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Why are ventricular dysrhythmias much more concerning than atrial dysrhythmias?
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- Although not considered the primary pacemaker of the heart, the atrioventricular node can indeed be considered as playing SOME role in setting the rhythm of the heart (kind of a secondary pacemaker). Explain how/why.What is autorhythmicity? Describe how nodal cells function as autorhythmic cells to serve as the pacemaker of the heart.Why is it important for impulses from the atria to be delayed at the AV node before they pass into the ventricles?
- What are the difference between contractile cells of the heart and electrical cells responsible for generation and conduction of impulses. Why is the cardiac action potential propagated more slowly in an AV node cell than in an atrial or ventricular myocyte? How are the channels and ions that are responsible for depolarization and repolarization work? How can be AV conduction affected by hypokalemia?High-pressure environments have a profound effect on the cardiopulmonary system. What are they?Why are interatrial septal defects more common thaninterventricular septal defects?