Tommy Anders Volume 2l |TOP|
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The next five generation of bronchioles have no cartilage or goblet cells, but still have elastic tissue and smooth muscle fibres. They lined with ciliated cuboidal epithelium. Relaxation and contraction of the smooth muscles of the bronchi and bronchioles can change the diameter of the air passageways and so change the volume of air moving through them. The alveoli provide a large surface area for gas exchange. The alveolar walls consist of simple squamous epithelium. Also the tissues surrounding the alveoli contain elastic fibres which allow the alveoli to expand during inspiration and recoil during expiration.[7] 2b1af7f3a8