Question

what is the primary function of a serous membrane?
answer

• lining cavities that communicate with the exterior
• reducing friction between the parietal and visceral surfaces
• providing nourishment and support to the body lining
• establishing boundaries among internal organs
• i dont know yet

Explanation:

Serous membranes (like pleura, peritoneum, pericardium) secrete serous fluid. This fluid lubricates the space between the parietal (lining cavity wall) and visceral (covering organ) layers, reducing friction during organ movement (e.g., heart beating, lung expansion). Other options: Lining external - communicating cavities is mucous membranes; nourishment/support isn’t their role; establishing organ boundaries isn’t primary (they lubricate for movement).

Answer:

B. Reducing friction between the parietal and visceral surfaces