Editing Bronchus (section)

==Function==
{{See also|Respiratory tract#Lower respiratory tract}}

The bronchi function to carry [[air]] that is breathed in through to the functional tissues of the lungs, called alveoli. Exchange of gases between the air in the lungs and the blood in the [[capillaries]] occurs across the walls of the alveolar ducts and alveoli. The [[alveolar ducts]] and alveoli consist primarily of simple [[squamous epithelium]], which permits rapid diffusion of [[oxygen]] and [[carbon dioxide]].