Final answer:
The fluid-filled membrane located between the visceral and parietal layers is known as a serous membrane or serosa, which reduces friction in cavities such as pleural, pericardial, and peritoneal.
Step-by-step explanation:
The membrane that contains fluid between the visceral and parietal layers is known as a serous membrane or serosa. These membranes are located in the thoracic and abdominopelvic cavities. The serous cavities formed by these membranes include the pleural cavity around the lungs, the pericardial cavity around the heart, and the peritoneal cavity surrounding several organs within the abdominopelvic cavity. These fluid-filled sacs are designed to reduce friction, allowing organs such as the heart and lungs to move smoothly during function. The serous fluid within these cavities acts as a lubricant, which is secreted by both the parietal and visceral layers of the serosa.