What is a serious membrane?

A serious membrane, or serous membrane, is a thin layer of tissue that lines certain internal cavities of the body, providing a smooth, lubricated surface to reduce friction between organs. It consists of two layers: the parietal layer, which lines the cavity wall, and the visceral layer, which covers the organs themselves. These membranes secrete serous fluid, which helps facilitate movement of organs such as the heart, lungs, and digestive organs. Examples of serous membranes include the pleura (around the lungs), pericardium (around the heart), and peritoneum (in the abdominal cavity).