Which organs are lined with mucous membranes?

Mucous membranes line several organs throughout the body, primarily those that are part of the respiratory, digestive, and urogenital systems. This includes the nasal passages, mouth, throat, esophagus, stomach, intestines, and the reproductive organs. They serve to protect underlying tissues and facilitate functions such as secretion and absorption. Additionally, mucous membranes are also found in the inner lining of the urinary tract.