The pleural, pericardial, and peritoneal cavities are referred to as serous cavities. The walls of these cavities and the organs

The pleural, pericardial, and peritoneal cavities are referred to as serous cavities. The walls of these cavities and the organs that lie within them are lined/covered with a serous membrane. Serous membranes are named so because they secrete a watery fluid. The membrane that lines the walls of the cavity is called the parietal serosa and the membrane that covers the organs within the cavity is called the visceral serosa. As these two membranes secrete a thin layer of slippery fluid, it allows for the organs covered within the visceral portion to smoothly move against the parietal portion freely without friction occurring.

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