3. The lung is closely related to the heart, not only by their location but also by the pulmonary circulation 4. The diseases specific to the lung(e.g damage to the wall of bronchial tree, obstruction of bronchioles and disintegration of alveolar/ capillary membrane)9 3. The lung is closely related to the heart, not only by their location but also by the pulmonary circulation. 4. The diseases specific to the lung (e.g damage to the wall of bronchial tree, obstruction of bronchioles and disintegration of alveolar/ capillary membrane)