Which type of synoviocyte phagocytoses cell debris and waste inside the joint cavity?

Which type of synoviocyte phagocytoses cell debris and waste inside the joint cavity?

• A. Type B
• B. Type C
• C. Type D
• D. Type A

Answer: (D)

The key idea here is that debris and waste inside the joint are cleared by macrophage-like cells in the synovial lining. These Type A synoviocytes resemble macrophages and actively phagocytose cell debris and waste within the joint cavity, helping keep the space clean and providing immune-related functions. In contrast, Type B fibroblast-like synoviocytes mainly produce components of the synovial fluid, such as hyaluronan, to lubricate and nourish the joint. So, the cell type responsible for phagocytosis is the Type A synoviocyte.

The key idea here is that debris and waste inside the joint are cleared by macrophage-like cells in the synovial lining. These Type A synoviocytes resemble macrophages and actively phagocytose cell debris and waste within the joint cavity, helping keep the space clean and providing immune-related functions. In contrast, Type B fibroblast-like synoviocytes mainly produce components of the synovial fluid, such as hyaluronan, to lubricate and nourish the joint. So, the cell type responsible for phagocytosis is the Type A synoviocyte.