Conduction System of the Heart and Electrocardiography (ex 31)

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1-Structure

Superior vena cava

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2-Structure

Internodal pathway

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3-Structure

Right Atrium

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4-Structure

Left atrium

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5-Structure

Subendocardial conducting network (Purkinje fibers)

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6-Structure

Interventricular septum

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1-Pathway

Sinoatrial (SA) node generates impulses (PACEMAKER OF THE HEART)

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2-Pathway

Impulses pause at atrioventricular (AV) node for about 0.1 seconds

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3-Pathway

AV bundle conducts the impulses to the bundle branches

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4-Pathway

Bundle branches conduct the impulses through the interventricular septum

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5-Pathway

Subendocardial conducting network depolarizes the contractile cells of both ventricles

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1

Atrial depolarization, initiated by SA node, causes P wave

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2

Atrial depolarization is complete and the impulse is delayed at the AV node

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3

Ventricular depolarization begins at the apex and causes the QRS complex. Atrial repolarization occurs

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4

Ventricular depolarization is complete

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5

Ventricular repolarization begins at apex and causes T wave

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6

Ventricular repolarization is complete