Here's why:

* Location: The peritoneum lines the abdominal cavity and covers the organs within it.

* Structure: Like all serous membranes, the peritoneum has two layers:

* Parietal layer: Lines the abdominal cavity wall.

* Visceral layer: Covers the organs within the cavity.

* Fluid: Between the parietal and visceral layers is a thin layer of serous fluid that lubricates the surfaces, allowing organs to move freely without friction.

Other examples of serous membranes include:

* Pleura: Lines the chest cavity and covers the lungs.

* Pericardium: Surrounds the heart.

Let me know if you'd like more information about serous membranes!