NURS 106 Lecture Notes - Lecture 28: Interventricular Septum, Purkinje Fibers, Atrioventricular Node
21 Nov 2018
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Document Summary
The ability to conduct impulses on its own. Main pacemaker where electrical impulses originates, located in the posterior wall of the right atrium conducting fibres , located on the floor of the right atrium. Receives impulse initiated by the sa node through impulse travels through internodal pathways impulses also travel outward through the cardiac muscle, starting atrial contraction. Autorhythmicity/automaticity : sa (sinoatrial) node , av (atrioventricular) node , av bundle (bundle of his) . Bundle of conducting fibres, receiving impulses from the av node: right bundle branch (rbb) and left bundle branch (lbb) . Receives information from the av bundle, from the interventricular septum which then divides into the left and right branches, travelling towards the apex of the heart: purkinje fibres . Branched out bundle branches , travelling through the ventricular myocardium impulse travels down conducting fibres travels outward through the ventricular myocardium, starting ventricular contraction. Slow depolarization, threshold -40mv, with no steady resting potential.
