Final answer:
A serous membrane is composed of two layers: the parietal layer and the visceral layer. The parietal layer lines the walls of the body cavity and the visceral layer covers the organs. Between these two layers is a thin fluid-filled space called the serous cavity.
Step-by-step explanation:
A serous membrane is composed of two layers: the parietal layer and the visceral layer. The parietal layer lines the walls of the body cavity, while the visceral layer covers the organs. Between these two layers, there is a thin fluid-filled space called the serous cavity.