American Academy of Professional Coders (AAPC) 2025 – 400 Free Practice Questions to Pass the Exam

The serous membrane is a critical component in supporting internal organs within the body. This type of membrane consists of two layers: the parietal layer, which lines the walls of the body cavity, and the visceral layer, which covers the organs. These membranes secrete a lubricating fluid known as serous fluid, reducing friction between the internal organs and the cavity walls as they move, thus providing support and protection.

The serous membrane is particularly important in cavities such as the pleural cavity (around the lungs), pericardial cavity (around the heart), and peritoneal cavity (surrounding various abdominal organs). This dual-layered structure not only supports the organs but also allows for smooth movement as they expand and contract during physiological processes like breathing or digestion.

Other options refer to different types of membranes that serve distinct purposes. The mucous membrane lines various cavities and passages that communicate with the exterior, like the respiratory or digestive tracts. The synovial membrane is found in joint cavities, providing lubrication to synovial joints. Meninges are protective membranes covering the brain and spinal cord. While all these membranes play vital roles, the serous membrane specifically supports internal organs through its structure and function.