Lecture 8 - Unit #5 Unit Circulatory System The Heart...

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Unit #5 Unit #5 Circulatory System Circulatory System The Heart The Heart
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Overview of Circulation Overview of Circulation The heart is a double pump There are two circuits The Pulmonary Circuit Sends O 2 poor blood to the lungs Right side of heart to lungs via pulmonary arteries The Systemic Circuit Sends O 2 rich blood to the lungs Left side of heart to body organs via aorta Fig. 19.1
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Oxygen-rich, 2 Oxygen-poor, 2 Capillary beds of lungs where gas exchange occurs Capillary beds of all body tissues where gas exchange occurs Pulmonary veins Pulmonary arteries Pulmonary Circuit Systemic Circuit Aorta and branches Left atrium Heart Left ventricle Right atrium Right ventricle Venae cavae Fig. 19.1
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Location and Orientation Location and Orientation Fig. 19.2 Heart Right lung Mediastinum Diaphragm Rib 2 Midsternal line The heart is located in the mediastinum (largest organ) Located between the lungs Angled to the left and 2/3 is left of median plane The apex lies to the left of the midline The base is the broad posterior surface
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Superior vena cava Left lung Aorta Parietal pleura (cut) Pericardium (cut) Pulmonary trunk Diaphragm Apex of heart Fig. 19.2c Right Atrium Right Ventricle Left Ventricle Left Atrium
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Fig. 19.2a 4 Corners of the Heart 4 Corners of the Heart Midsternal line 2 3 4 5 6 7 1
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Pericardium Heart Structures - Covering Heart Structures - Covering Pericardium triple layer sac enclosing the heart 1st layer Epicardium Strong layer of dense connective tissue 2nd & 3rd layer Myocardium & Endocardium Made up of two layers Parietal pericardium Visceral pericardium Fig. 19.3
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Fig. 19.3 Fibrous pericardium Parietal layer of serous pericardium Pericardial cavity Epicardium (visceral layer of serous pericardium) Myocardium Endocardium Pulmonary trunk Heart chamber Heart wall
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Layers of the Heart Wall Layers of the Heart Wall There are three layers in the
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This note was uploaded on 09/28/2011 for the course BIOL 301 taught by Professor Pickard during the Spring '09 term at Waterloo.

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Lecture 8 - Unit #5 Unit Circulatory System The Heart...

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