Line internal spaces of organs and tubes and body cavities
Line the interior walls of the organs and tubes that open to the outside of the body, such as those of the digestive, respiratory, urinary, and reproductive systems.
Mucous membranes
Line cavities, including the thoracic cavity and internal organs (e.g. heart). The pleura covers the lungs; the heart is covered by the pericardium; the peritoneum lines the abdominopelvic cavity and covers the organs within.
Serous membranes
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