👉 Semiplumaceous is a medical term that refers to a type of tissue in the human body called a pleural sac. These are smaller structures located around the lungs and are responsible for providing protection from dust, smoke, and other airborne particles that can cause lung damage or infection. In general, pleural sacs are found in the thoracic cavity, which is the space between the chest wall and the rib cage. They contain fluid, called sputum, which helps to protect the lungs
