Vein Heart Semilunar valve Superior vena cava Pulmonary artery Inferior vena cava Right ventricle Tricuspid valve Pulmonary semilunar valve Right atrium Pulmonary veins Aorta Pulmonary artery Aortic semilunar valve Pulmonary veins Left atrium Mitral valve Left ventricle Interventricular septum Connective tissue Smooth muscle Endothelium Vein valve Smooth muscle Connective tissue Endothelium Endothelium Capillary F Artery The circulatory system 204
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