pulmonary embolism. human lungs and heart.

anatomical anatomy and arteriosclerosis artery biology blood body breath bronchi care circulatory close clot cross deep diagram disease embolism embolus flow health healthcare healthy heart human hypertension internal lung lungs medical medicine organ pain pathology pressure pulmonary respiration respiratory science section symbol system thromboembolism thrombosis thrombus trachea vein veins venous vessels