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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PVC and FPO membranes are heat welded at the seams giving superior protection against leaks as the two sheets are fused together which forms a complete and durable roofing membrane system. Single-ply membranes are given UV stabilisers allowing for long term use in exposed roof applications.VC (polyvinyl chloride) and FPO (Flexible polyolefin) share many common characteristics, neither can claim an overall superiority over the other, however particular characteristics of each of these two polymers can be exploited by the specifier to enhance the specification of their single ply roofing system.