What is the mesothelium? Many of the internal organs of the body are protected by a membrane called the mesothelium. This membrane actually consists of two layers of cells. The inner layer surrounds the organs, and the second is a sac surrounding the inner layer. When organs within this membrane must move or expand or contract -- such as the heart, lungs, bladder, and so on, they are able to do so because the mesothelium produces a lubricating fluid between the two layers. What

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