The human body features four major types of specialized anatomical membranes that protect organs, line cavities, and cover internal surfaces: mucous membranes, serous membranes, cutaneous membranes, and synovial membranes. Mucous membranes line tracts that open to the outside, such as respiratory and digestive passageways. Serous membranes line closed internal cavities like the chest and abdomen, reducing friction between moving organs. The cutaneous membrane is our skin, serving as the main external barrier. Synovial membranes line joint cavities, secreting lubricating fluid to ensure smooth skeletal articulation and reduce friction between moving bones.
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