Mucous membranes line body cavities that communicate with the exterior, such as the respiratory and digestive tracts, and their main function is to keep these cavities moist, which helps to protect against infection and damage. Hence, option D is the best choice as it accurately describes the function of mucous membranes.

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Mucous Membranes

Question 36

Multiple Choice

Mucous membranes

A) line body cavities that communicate with the exterior.
B) keep epithelial surfaces moist.
C) warm epithelial surfaces.
D) line body cavities that communicate with the exterior and keep them moist.
E) None of the answers are correct.

Correct Answer: