Bronchial artery supplies all except:

Ans: d (Alveolar sac)Ref: Essentials of Human Anatomy By AK Dutta-Thorax & Abdomen, 3rd edi., Observations on the normal anatomy of the bronchial arteries by L. Cudkowicz* And J. B. Armstrong, Chaurasia, 4th edi., Pg. 227.Arterial supply of the lungs: The bronchial arteries supply nutrition to the bronchial tree and to the pulmonary tissue. On the right, there is one bronchial artery and on the left, two which arise from the descending thoracic aorta.Each bronchial artery arises from descending thoracic aorta.Bronchial artery supplies:Bronchial tree up to terminal bronchial tubeThe walls of pulmonary vesselsFibro elastic septa &Hilar lymph nodesRespiratory bronchiole, alveolar duct and sac are supplied by pulmonary artery. Up to alveolar duct it gets anastomotic branch from bronchial artery.Therefore alveolar sac is the answer of exception.