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Structure
Nasal cavity
Nasal cavity and the superior portion of the pharynx are made up of a respiratory mucosa (mucos membrane) with mucous cells and the mucous escalator formed by the cilia of ciliated simple columnar epithelial cells
Inferior portions of the pharynx (back of the throat)
The conducting portion
The conduction portion of the lower respiratory tract is made of the same respiratory mucosa
The finer bronchioles
consists of cuboidal epithelium
The alveoli provide a large surface area
The alveoli provide a large surface area and consist of a delicate simple squamous epithelium for gas exchange. The alveoli are covered by the extensive capillary network of the pulmonary circulation. here the distance between the air and the blood in adjacent capillaries is less than 1um. The site of gas exchange is knows as the respiratory membrane
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