Heart - Circulatory System HEART Heart Anatomy Figure 18.1...

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Circulatory System
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HEART
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Heart Anatomy Figure 18.1
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Heart Coverings Pericardium Protects the heart Anchors the heart Reduces friction when the heart is beating Prevents overfilling of the heart with blood Endocardium Lines the heart chambers
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Pericardial Layers of the Heart Figure 18.2
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Pericardium Double-walled sac around the heart Consists of the following components: A superficial fibrous pericardium A deep two-layer serous pericardium Parietal pericardium lines the internal surface of the fibrous pericardium The visceral pericardium (epicardium) covers the surface of the heart The parietal pericardium and visceral pericardium are separated by the fluid-filled Pericardial Cavity
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Myocardium Muscle component of the heart Comprised of cardiac muscle tissue (involuntary muscle) Located between the endocardium and the visceral pericardium
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Pericardial Layers of the Heart Figure 18.2
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Heart Chambers Two superior chambers Right atrium Left atrium Two inferior chambers Right ventricle Left ventricle
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External Heart: Anterior View Figure 18.4b
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Heart - Circulatory System HEART Heart Anatomy Figure 18.1...

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