Pulmonary structures are encased within a dual-walled membranous sac designated as___________?
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Answer: B. Pleura
Explanation
Pulmonary structures are encased securely within a specialized dual-walled membranous sac designated as the pleura. This serous membrane consists of a visceral layer covering the lungs and a parietal layer lining the chest. A thin layer of lubricating fluid between the pleural membranes reduces friction during continuous respiratory movements. Serous membranes line closed body cavities and secrete lubricating fluids to protect delicate internal organs. The intrapleural pressure within this closed cavity remains negative relative to atmospheric pressure to keep lungs inflated. Inflammation of this membranous lining results in a painful clinical condition known medically as pleurisy.
Pathological accumulation of air or fluid in the pleural space can lead to a dangerous lung collapse. Thoracic surgeons perform thoracentesis procedures to sample pleural fluid or relieve abnormal pressure buildup. Understanding pleural mechanics is essential for managing trauma patients suffering from penetrating chest injuries. Diaphragm refers to the primary skeletal muscle dome that separates the thoracic and abdominal cavities. Pericardium designates the specialized double-layered membranous sac that encloses and protects the human heart. Rib cage is a bony and cartilaginous skeletal structure providing structural protection for thoracic organs.
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