What membranes line body cavities that lack openings to the outside of the body?

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Quizplus · Accepted Answer

Serous membranes line body cavities that lack openings to the outside of the body. These membranes secrete a lubricating fluid that allows organs to move without causing friction or damage. Examples of serous membranes include the pleura (lining the lungs), pericardium (lining the heart), and peritoneum (lining the abdominal cavity). Mucous membranes line body cavities that do have openings to the outside of the body (such as the respiratory and digestive tracts). Epithelial membranes are a broad category that includes both mucous and serous membranes, as well as the cutaneous membrane (skin). Synovial membranes line the cavities of joints and secrete synovial fluid for lubrication.

What Membranes Line Body Cavities That Lack Openings to the Outside