What is "mucus membrane"?

The mucous membrane refers to a thin, moist layer of tissue that lines various body cavities and passages, including the respiratory tract, digestive system, urinary tract, and reproductive organs. Mucous membranes secrete mucus, a viscous fluid that helps to protect and lubricate these surfaces. They serve as a barrier against harmful substances, such as pathogens and irritants, and provide a conducive environment for the proper functioning of the organs they line. Mucous membranes also play a role in the absorption and secretion of substances, contributing to essential physiological processes.