Ch. 14 The Cardiovascular System - Heart

Ch. 14 The Cardiovascular System - Heart - The...

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Unformatted text preview: The Cardiovascular System Heart Structure and Function The heart is hollow, cone-shaped, about the size of a closed fist Lies in the mediastinum between the lungs and rests upon the diaphragm Two-thirds of its mass lies to the left of the midline Apex - lower, pointed end Base- broader, superior portion Structure and Function Pericardium Fibrous pericardium Inelastic Prevents overstretching Serous pericardium Parietal pericardium Fused to fibrous pericardium Visceral pericardium Pericardial cavity Structure and Function Epicardium composed of mesothelium and connective tissue Myocardium muscular pumping layer 95% of the heart wall Endocardium layer of endothelium covering connective tissue continuous with the endothelium of the blood vessels connected to the heart Checkpoint: Collaborative Learning Endocarditis What is it and where does it occur? Structure and Function R and L atria Receive blood returning to the heart via the veins, auricles allow increases in blood volume R and L ventricles powerful pumping chambers Structure and Function Pulmonary pump right atrium and right ventricle moves deoxygenated blood through the lungs Systemic pump left atrium and left ventricle pumps oxygenated blood to all systems of the body Structure and Function Coronary sulcus demarcates the atria from the ventricles Anterior interventricular sulcus marks the external boundary between right and left ventricles Posterior interventricular sulcus marks the external boundary between ventricles on the posterior surface Right Atrium Receives deoxygenated blood from three veins Superior vena cava (SVC) Inferior vena cava (IVC) Coronary sinus Right Atrium Superior vena cava (SVC) drains blood from parts of the body superior to the heart Inferior vena cava (IVC) brings blood from all parts of the body inferior to the diaphragm Coronary sinus receives blood from most of the vessels draining the wall of the heart Right Atrium Anterior wall has internal muscular ridges called pectinate muscles Interatrial septum separates the atria Fossa ovalis oval depression on the septum remnant of the foramen ovale Tricuspid valve separates R. atrium from R. ventricles Right Ventricle Forms most of the anterior surface of heart Inner surface lined with ridges called trabeculae carneae The chordae tendineae attach to the tricuspid valve cusps which are then connected to the papillary muscles Interventricular septum separates the two ventricles Right Ventricle...
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Ch. 14 The Cardiovascular System - Heart - The...

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