Lungs are separated from abdominal cavity by a muscular sheath called:

Explanation

Option A: The pleura is a thin layer of tissue that lines the lungs and the chest cavity. It is a serous membrane, which means that it produces a fluid that helps to lubricate the surfaces of the lungs and the chest cavity. This fluid helps to reduce friction as the lungs move during breathingOption B: The rib cage is the bony structure that surrounds the lungs. It is made up of 12 pairs of ribs, which are connected to the spine and the sternum. The rib cage helps to protect the lungs and other organs in the chest cavity. Option C: The pericardium is a sac that surrounds the heart. It is made up of two layers: the outer layer is called the fibrous pericardium, and the inner layer is called the serous pericardium. The pericardium helps to protect the heart and to keep it in place. Option D: The lungs are separated from the abdominal cavity by a muscular sheath called the diaphragm. The diaphragm is a dome-shaped muscle that separates the chest cavity from the abdominal cavity. It is responsible for breathing, and it helps to move air in and out of the lungs.