What is a key characteristic of serous membranes?

A key characteristic of serous membranes is that they consist of simple squamous epithelium over connective tissue. This structure is essential in allowing for the functions of these membranes, which include reducing friction between internal organs and providing a smooth surface for movement. The simple squamous epithelium is particularly well-suited for this purpose due to its thinness, facilitating easy exchange of fluids and nutrients between the tissue and the underlying connective tissue.

Serous membranes, such as those lining the thoracic cavity (pleura) and surrounding organs in the abdominal cavity (peritoneum), play a crucial role in maintaining homeostasis and protecting organs by secreting serous fluid, which provides lubrication. This helps to minimize wear and tear during organ movement.