BIO 12 Lecture Notes - Lecture 18: Electrical Conduction System Of The Heart, Interventricular Septum, Superior Vena Cava
14 Sep 2020
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Document Summary
Specialized section of the myocardium that initiates and regulate the cardiac cycle. The primary and natural or intrinsic pacemaker of the heart that initiates each heartbeat. Generates an electrical impulse of 60-100 beats per minute (bpm); the normal heart rate. 160-180 bpm normal range of children"s heart rate. Location: junction of superior vena cava and ra. Location: lower aspect of the atrial septum. Receives electrical impulses from the sa node. If the sa node fails, the av node can initiate and sustain a heartbeat of 40-60 beats/ minute. Branches into the right bundle branch which extends down the right side of the interventricular septum, and the left bundle branch which extends into the left ventricle. The right and left bundle branches terminate into purkinje fibers. Diffused network of conducting strands located beneath the ventricular endocardium. They spread the wave of depolarization through the ventricles.
