(a) The
lungs are located in the thorax, surrounded by ribs and
connected to the trachea. Compression and expansion of the rib
cage force air in or out of the lungs. (b) Cutaway view of the
internal lining of the lungs showing numerous faveoli that
collectively give the lining a honeycomb appearance. The internal
faveoli of the lungs increase their respiratory surface area and
function in gas exchange with capillaries lining their walls.