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Dramatically depicts the heart and coronary arteries with potential plaque blockage sites.  Labels for superior vena cava, aorta, left pulmonary artery, pulmonary trunk, right coronary artery,  left main coronary artery, circumflex branch, left anterior descending branch and others. Details: A. Normal artery with a clear lumen and bloodflow; B. Initial build-up of plaque within the lumen allowing only partial bloodflow; C. Final condition with totally blocked artery.