Bronchial aery supplies lungs up to:: (A) Teiary bronchioles, (B) Respiratory bronchiole, (C) Alveolar ducts, (D) Terminal bronchiole
Answer is B. Bronchial aeries carry oxygen to tracheobronchial tree and lung parenchyma and supplies till the level of respiratory bronchiole. Pulmonary aeries alone vascularize the fuher distal pathways, including alveolar ducts and the alveoli.