Question

the fluid that lubricates movable joints is produced by
○ synovial membrane.
○ serous membrane.
○ plasma membrane.
○ cutaneous membrane.
○ mucous membrane.

Explanation:

To solve this, we analyze each option:

• Synovial membrane: Lines synovial joints and produces synovial fluid (lubricates movable joints).
• Serous membrane: Lines body cavities, secretes serous fluid (not for joints).
• Plasma membrane: Cell membrane (not related to joint lubrication).
• Cutaneous membrane: Skin (not for joints).
• Mucous membrane: Lines cavities with openings to outside, secretes mucus (not for joints).

So the correct option is the one with synovial membrane.

Answer:

A. synovial membrane.