Serous Membrane Serous Membrane is composed of a layer simple squamous epithelium resting on a thin layer of areolar connective tissue. The Serous membranes line body cavities that are closed to the exterior. Serous membrane occurs in pairs. The parietal layer lines a specific portion of the wall of the ventral body cavity. It folds in on itself to form the visceral layer, which then converts the outside of the organs in that cavity. These layers are separated by a scanty amount of thin, clear fluid, called serous fluid, which is secreted by both membranes.
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What is pulmonary fibrosis? Pulmonary fibrosis, or idiopathic pulmonary fibrosis (IPF), is a rare condition causing scarring of the lungs and shortness of breath and coughing. There is no cure for pulmonary fibrosis. Treatments such as oxygen can help with respiratory symptoms, but the disease progresses over time and can be fatal. Pulmonary fibrosis is thought to be caused by damage to cells in the lungs called alveoli, though the precise reasons for the damage are still not clear.