Chapter 32 Heart Physiology

Chapter 32 Heart Physiology - Chapter 32 Conducting System...

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Chapter 32 Conducting System of the Heart and Electrocardiography
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An Overview of Cardiac Physiology
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The intrinsic conducting system ¢ Functional syncytium l Gap junctions
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The intrinsic conducting system ¢ Controlling system over the heart l Autonomic nervous system Sympathetic Parasympathetic l Intrinsic conducting system or nodal system Specialized myocardial tissue Initiates the heart beat
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¢ The conducting system includes: l Sinoatrial (SA) node (80-100 bpm) Contain the pacemaker cells Located in the right atrium l Atrioventricular (AV) node (40-60 bpm) Located in the atrium septum at the junction of the atria and ventricles The Intrinsic Conducting System
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The Intrinsic Conducting System l AV bundle or bundle of His Located in the interventricular septum l Right and Left bundle branches Located in the interventricular septum l Purkinje fibers Located in the myocardium Larger in the left ventricle
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¢ SA node begins the action potential ¢ Stimulus spreads across the atria
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This note was uploaded on 01/06/2012 for the course BIOL 2402 taught by Professor Elainefanin during the Spring '11 term at Collins.

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Chapter 32 Heart Physiology - Chapter 32 Conducting System...

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