Senses, Endocrine, Blood, Heart, and Reproductive System Practice Test 2026 – Comprehensive All-in-One Guide to Mastering Your Exam!

Lining the lungs and the chest cavity is provided by the pleura, a serous membrane that forms two layers: the visceral pleura covers the lungs, and the parietal pleura lines the thoracic cavity and diaphragm. The space between them, the pleural cavity, contains a small amount of pleural fluid that reduces friction during breathing and helps the lungs expand smoothly. Peritoneum lines the abdominal cavity, endocardium lines the inner surface of the heart, and epithelium is a tissue type that lines many surfaces but is not the specific membrane around the lungs. So the membrane you’re looking for is the pleura.