age- easy to collapse, result to retention of gas and effect the exchange of gas.?The amount and size of alveolus is less and small.?Chest is shorter and in a barrel shape, has a smaller scope of activitiesРThe airway are lined with an epithelial membrane that gradually changes from ciliated pseudostratified columnar epithelium in the bronchi to a ciliated cuboidal epithelium near the gas-exchanging units. The three lobes (upper, middle and lower) of right lung has separated by the horizontal and oblique fissures, respectively.РThe left lung has two major lobes (upper and lower) separated by an oblique fissure, and the upper lobe is itself divided into upper and lingular lobes. The right lung and the left lung project low down behind the dome of the diaphragm and peak behind the clavicles.
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