bronchial artery - arteries that accompany the bronchioles

pulmonary vein, vena pulmonalis - any of four veins that carry arterial blood from the lungs to the left atrium of the heart

alveolar bed - lung tissue densely packed with alveoli

lobe of the lung - any of the three lobes of the right lung or the two lobes of the left lung

lower respiratory tract - the bronchi and lungs

respiratory organ - any organ involved in the process of respiration

air cell, air sac, alveolus - a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways