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Serous membranes ooze their materials to an interior surface, such as in the chest cavity. The watery fluid will eventually be reabsorbed back into the blood but it serves to lubricate the surface. There are three of these membranes, each consisting of simple epithelium supported by loose connective tissue: the pleura, the peritoneum, and the pericardium.
A mucous membrane has mucus secreting cells in it (often called goblet cells) - and mucous is formed from complex chains of proteins and sugars that create a sticky mass (usually clear). These membranes line surfaces that are in potential contact with the environment. Foreign material will stick to the mucous- it is an effective and important defense barrier. Mucous membranes can be found lining the digestive, respiratory, reproductive, and urinary tracts. The epithelial surfaces are kept moist at all times.

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