Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
a. The trachea contains O-shaped rings of hyaline cartilage.
b. Goblet cells secrete serous fluid into the respiratory tract.
c. The framework of the larynx is formed by nine pieces of cartilage, the largest of which is the thyroid cartilage.
d. The pseudostratified ciliated columnar epithelium of the respiratory tract warms, filters, and humidifies the inspired air.
e. The epithelium of the oropharynx changes from stratified columnar epithelium to simple squamous epithelium to enable it to resist abrasion from food.
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