ENH 220 Lecture Notes - Lecture 7: Anterior Interventricular Branch Of Left Coronary Artery, Coronary Vasospasm, Superior Vena Cava

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2/3 of heart mass lies left of midsternal line. Apex of heart points downward toward the left hip: heart coverings. Pericardium (double-walled sac, outer layer of tough connective tissue. Epicardium (visceral layer of pericardium covering myocardium: layers of the heart wall. Epicardium: outer layer of connective tissue, coronary arteries. Myocardium: middle layer, muscular, thickest layer, workhorse of the heart. Endocardium: innermost layer, smooth membrane, heart valves part of endocardium: chambers: no direct communication between right and left halves. Right half (right atrium, ra, and right ventricle, rv: pulmonary pump, circulates blood into pulmonary artery, lungs. Left half (left atrium, la, and left ventricle, lv: systemic pump, circulates blood into aorta, organs and tissues, atria (singular: atrium) = receiving chambers, thin-walled, blood enters ra via three veins: Superior vena cava (from body regions above diaphragm) Inferior vena cava (from body areas below diaphragm)

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