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heart liver lymphatics capillary vein artery bloodvessels embryology bloodvessel histology blood blood vessels heart disorders congenital malformation of the heart malformation of heart upper gi tract duodenum mouth stomach esophagus gas exchnage alveoli bronchs trachea bronchioles histology of the lung lung lung development limiting plate zones of the liver portal tract hepatic lobules hepatic cords ito cells space of disse glycogen in te liver embryology of the liver histology of the live gi tract