Lungs are enclosed in:

Explanation

All options are explained below: a)Periosteum: Periosteum is a dense layer of vascular connective tissue that covers the surface of bones. It is not related to the lungs but is associated with bones. B. Perichondrium:Perichondrium is a dense connective tissue that surrounds cartilage. It is not the structure that encloses the lungs. C. Pericardium: Pericardium is the protective double-layered membrane that surrounds the heart. It is not the structure that encloses the lungs. D. Pleural membrane (Correct Option): The pleural membrane is the correct answer. The pleural membrane consists of two layers, the visceral pleura (which covers the lungs) and the parietal pleura (which lines the chest cavity). These layers create the pleural cavity, a fluid-filled space between them that encloses and protects the lungs. The pleural membranes allow the lungs to expand and contract within the chest cavity during breathing. Correct Option: D. Pleural membrane Summary: The lungs are enclosed in the pleural membrane, which consists of two layers, the visceral and parietal pleurae, and forms the pleural cavity. This arrangement allows the lungs to move within the chest cavity during the process of breathing and provides protection for the delicate lung tissue. The other options (A, B, and C) are not associated with the encasement of the lungs.