Question

What is the serous membrane that lines the walls of the thoracic cavity?

Answer 1

The pleura is the serous membrane lining the walls of the thoracic cavity, with a parietal layer against the cavity wall and a visceral layer covering the lungs, and a fluid-filled space in between to reduce friction.

Step-by-step explanation:

The serous membrane that lines the walls of the thoracic cavity is known as the pleura. This thin, double-layered membrane has a parietal layer that lines the cavity wall and a visceral layer that covers the external surface of the lungs. Between these layers is the pleural cavity, containing a small amount of serous fluid that acts as a lubricant, reducing friction during respiratory movements.

There are other serous membranes within the body, including the pericardium that surrounds the heart and the peritoneum that lines the abdominal cavity. These membranes provide a smooth and slippery lining, protect the organs they encase, and help to prevent friction, which could lead to inflammation.

Answer 2

The pleura serous membrane is found lining the thoracic cavity and the lungs. The pleura membrane is folded and creates a sac around the filled with pleural fluid. the pleural fluid is created and reabsorbed continuously. There are two pleura serous membranes, one for the left lung and the other for the right lung.