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Eventually, the bronchi become known as bronchioles â the smallest air tubes in the lungs. This system of air tubes can be thought of as an upside down tree, with the trachea being the main trunk and the bronchi and bronchioles being the branches. The medical term for all the air tubes is 'the respiratory tract'.
Each root is made up of a main stem bronchus (large air passage connecting the windpipe to the right or left lungs), pulmonary artery (major artery that brings oxygen-poor blood back to the right or left lungs), pulmonary vein (major vein receiving oxygen-rich blood from the lobes of the right or left lungs), the bronchial arteries and veins, as ...