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- A membrane is a thin, flexible tissue that covers, lines, partitions, or connects structures.
- A serous membrane is a double-layered membrane associated with body cavities that do not open to the exterior.
- A serous membrane covers the viscera in the thoracic and abdominal cavities.
- A serous membrane also lines the walls of the thorax and abdomen.
- The parietal layer lines the walls of body cavities.
- The visceral layer covers and adheres to the viscera.
- A small space exists between the parietal and visceral layers.
- This space contains serous fluid.
- Serous fluid acts as a lubricant between membrane layers.
- Lubrication allows viscera to move smoothly during movement.
- An example of such movement is lung expansion and contraction during breathing.
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