Which structure is composed of two thin tissue layers that secrete fluids?

• A. Serous membrane
• B. Cutaneous membrane
• C. Mucous membrane
• D. Synovial membrane

Answer: (A)

Verified step by step guidance

1. Understand the question: The problem is asking which structure is composed of two thin tissue layers that secrete fluids. This requires knowledge of the different types of membranes in the body and their functions.
2. Review the options: The options provided are Serous membrane, Cutaneous membrane, Mucous membrane, and Synovial membrane. Each of these is a type of membrane with distinct characteristics.
3. Define the key term 'serous membrane': Serous membranes are composed of two thin layers of tissue—an outer parietal layer and an inner visceral layer. These layers secrete serous fluid, which reduces friction between organs and surrounding structures.
4. Compare with other options: Cutaneous membranes (e.g., skin) are thick and do not secrete fluids in the same way. Mucous membranes line cavities that open to the exterior and secrete mucus, not serous fluid. Synovial membranes are found in joints and secrete synovial fluid, not serous fluid.
5. Conclude based on the evidence: The structure that matches the description of two thin tissue layers secreting fluids is the serous membrane.