The serous membrane that covers the interior surface of the abdominal cavity is the .

The serous membrane that covers the interior surface of the abdominal cavity is the peritoneum.

Explanation:

The peritoneum is a fine, thin membrane that acts as a protective layer for the abdominal organs. It has two layers: the parietal peritoneum, which lines the abdominal wall, and the visceral peritoneum, which covers the organs within the abdomen. This membrane plays an essential role in allowing the movement of the abdominal organs and serves as a conduit for nerves, blood vessels, and lymphatics between the organs. Additionally, the peritoneal cavity also contains a small amount of lubricating fluid that facilitates the smooth movement of the organs as they expand and contract during digestion.