Mucous membranes are thin layers of tissue that line various cavities in the body and cover internal organs. They produce a sticky substance called mucus, which helps keep these areas moist and protects them from infection. You can find mucous membranes in places like the nose, mouth, and lungs. These membranes play a crucial role in our health by trapping dust, germs, and other particles, preventing them from entering the body. They also help with functions like digestion and respiration by facilitating the movement of food and air. Overall, mucous membranes are essential for keeping our bodies functioning smoothly.