Question

part a the serous membrane lining the thoracic cavity is the ______. options: pleura, peritoneum, periosteum, pericardium

Explanation:

The pleura is the serous membrane that lines the thoracic cavity (and also covers the lungs). The peritoneum lines the abdominal cavity, the pericardium lines the heart cavity, and the periosteum covers bones, so they don't match the thoracic cavity lining.

Answer:

A. pleura