HLSC 3P90 Lecture 2: CHSC 3P90 - Lecture 2- Electrical Activity of the Heart.docx
6 Dec 2013
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Chsc 3p90 lecture 2: electrical activity of the heart. Automaticity ability of specialized cells to initiate an electrical impulse spontaneously. Excitability ability of cardiac cells to respond to an electrical impulse. Conductility ability to transmit an impulse from one cardiac cell to another. Contractility ability of cardiac cells to contract after receiving an electrical impulse. Autorhythmic: can initiate an impulse in its own. Carries impulse wave that it generates to the atrioventricular (av) node via intermodal pathways. Located in the right atrium (near the bottom) close to the ventricle. Major function: provides a signal delay (0. 06 0. 1 s) to prevent the signal from travelling to the ventricles too rapidly. Gives the ventricles time to fill up. One way conduction prevents re-entry of the impulses form the ventricle. Maintains hr of 40 60 bpm. Thin bundle of threads connecting the av node to the bundle branches. Located in the right side of the interatrial septum just above the ventricles.
