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The serous membranes have two segments - the visceral segment (which house the internal organs) and the parietal segment (which line the body wall). The serous membranes that take care of the lungs are called pleurae, and those that look after the abdominal cavity are called peritoneum (or peritoneal membranes).
mucous membranes are the moist linings of the orifices and internal parts of the body that are in continuity with the external surface. They cover, protect, and provide secretory and absorptive functions in the channels and extended pockets of the outside world that are incorporated in the body.