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Heart’s Place in the Circulation • How Does the Heart Pump Blood into Two Circuits in Sequence? • Pulmonary circuit • To and from the lungs • Systemic circuit • To and from the rest of the body Copyright © 2007 Pearson Education, Inc., publishing as Benjamin Cummings Heart’s Place in the Circulation • What are the Two Sets of Pumping Chambers in Heart? • Right atrium • Receives systemic blood • Right ventricle • Pumps blood to lungs (pulmonary) • Left atrium • Receives blood from lungs • Left ventricle • Pumps blood to organ systems (systemic) Copyright © 2007 Pearson Education, Inc., publishing as Benjamin Cummings The Anatomy of the Heart • What is the Pericardial Cavity? • Surrounds the heart • Lined by pericardium • Two layers • Visceral pericardium (epicardium) • Covers heart surface • Parietal pericardium • Lines pericardial sac that surrounds heart Copyright © 2007 Pearson Education, Inc., publishing as Benjamin Cummings The Anatomy of the Heart • What are the Three Layers of the Heart Wall? • Epicardium (visceral pericardium) • Outermost layer • Serous membrane • Myocardium • Middle layer • Thick muscle layer • Endocardium • Inner lining of pumping chambers • Continuous with endothelium Copyright © 2007 Pearson Education, Inc., publishing as Benjamin Cummings The Anatomy of the Heart • What is the Internal Anatomy and Organization? • Interatrial septum • Separates atria • Interventricular septum • Separates ventricles • Atrioventricular valves • Located between atrium and ventricle • Ensure one-way flow from atrium to ventricle Copyright © 2007 Pearson Education, Inc., publishing as Benjamin Cummings