Question

which type of tissue membrane is thin but strong and lines cavities that are not open to the outside with fluid that reduces friction?

synovial
serous
cutaneous
mucous

Explanation:

Analyze the membrane characteristics

• Lines closed internal cavities (not open to the outside).
• Thin but strong.
• Secretes a watery fluid (serous fluid) to reduce friction between organs and cavity walls.

Evaluate the options

• Synovial: Lines joint cavities, not general body cavities.
• Serous: Lines closed ventral body cavities (pleural, pericardial, peritoneal) and secretes friction-reducing fluid.
• Cutaneous: The skin, which is dry and exposed to the outside.
• Mucous: Lines cavities open to the outside (digestive, respiratory tracts).

Answer:

• (A) Synovial
• (B) Serous (Correct answer)
• (C) Cutaneous
• (D) Mucous