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Cardiac Conduction System

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Presentation on theme: "Cardiac Conduction System"— Presentation transcript:

1 Cardiac Conduction System
Describes the electrical events of the heart Autorhythmicity: electrical impulses generate within the heart, not from the nervous system SA node Pacemaker AV node AV bundle Purkinje fibers

2 Cardiac Cycle Describes the mechanical events of the heart
Syncytium: a group of cells functioning as a single unit in sync Systole: contraction Diastole: relaxation

3 Atrial systole Beginning of cardiac cycle
Caused by depolarization of SA node Forces blood from atria through AV valves into ventricles

4 Ventricular systole Caused by depolarization of Purkinje fibers
AV valves are forced shut Forces blood from ventricles through semilunar valves into arteries Atria are in diastole

5 Ventricular diastole Blood passively fills atria
Pressure in the atria builds until AV valves open and blood passively fills ventricle Semilunar valves close

6 The EKG

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