American Academy of Professional Coders (AAPC) Practice Exam

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What is the primary role of the serous membrane?

Providing insulation
Line the cavities of the body
Facilitating blood circulation
Regulating oxygen exchange

The correct answer is: Line the cavities of the body

The primary role of the serous membrane is to line the cavities of the body, particularly the thoracic and abdominal cavities. These membranes are composed of two layers, the parietal layer which adheres to the cavity wall, and the visceral layer which covers the organs. The serous membrane produces a serous fluid that acts as a lubricant, allowing organs to move smoothly against each other and against the cavity walls, reducing friction during movements such as breathing or digestion. This is crucial for the proper functioning of organs and assists in maintaining their health. The other functions described in the options do not align with the role of the serous membrane. Insulation is typically provided by other types of tissues rather than membranes. Blood circulation is primarily the function of the cardiovascular system, and oxygen exchange occurs mainly in the lungs and other respiratory structures, not in serous membranes.