Respiratory

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Figure 23.2 Respiratory Mucosa. A mucosa forms the inner lining of the respiratory tract and is called the respiratory mucosa. (a) The general structure of the mucosa includes three major layers: an epithelium, basement membrane, and an underlying lamina propria. (b) The types of epithelia in the mucosa become progressively thinner along the length of the respiratory tract. (c) Exceptions to the general thinning pattern occur in places subject to abrasion.
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