The bronchial arteries are branches of the descending aorta (not pulmonary arteries) and supply the bronchi, the lung connective tissue and the visceral pleura.

The bronchial veins communicate with the pulmonary veins and drain into the azygos and hemiazygos veins.

The terminal branches of the pulmonary arteries deliver deoxygenated blood to the alveoli (not oxygenated).

Following oxygenation the blood leaves the alveolar capillaries and drains into the tributaries of the pulmonary veins, which follow the intersegmental connective tissue septa to the lung root, thus there are a total of four (not two).