Final answer:
True, mucous membranes are important as they lubricate and protect body passageways by secreting mucus and employing cilia to remove pathogens.
Step-by-step explanation:
Mucous membranes are important because they lubricate and protect passageways, which is true. These membranes provide a crucial mechanical barrier to pathogens, lining various body systems such as the respiratory, gastrointestinal, urinary, and reproductive tracts. Mucous membranes secrete mucus, a sticky substance that traps pathogens.
Additionally, many mucous membranes have cilia, which are hair-like structures that sweep mucus and trapped pathogens toward body openings, facilitating their removal when actions like sneezing or coughing occur. Columnar epithelial cells also release mucus in the digestive tract, which provides both lubrication and antimicrobial protection.