Question

mucous membranes line the surfaces of which of the following? select all that apply a the gastrointestinal tract b the urinary tract c the respiratory tract d the circulatory tract

Explanation:

Mucous membranes line body cavities that open to the outside. The gastrointestinal, urinary, and respiratory tracts open to the exterior of the body and are lined by mucous membranes. The circulatory system is a closed - loop system and does not have mucous membranes lining it.

Answer:

A. the gastrointestinal tract, B. the urinary tract, C. the respiratory tract