Lymph Node Functions and Cellular Immunity

Lymph nodes play a critical role in the immune system by filtering lymph fluid.
The process of removing bacteria and debris from lymph is facilitated primarily by specific types of cells, including:
- Phagocytic cells:
- Definition: Cells that have the ability to engulf and digest cellular debris and pathogens.
- Examples: Macrophages and neutrophils.
- Function: Phagocytic cells in lymph nodes actively clear pathogens through the process of phagocytosis.
- Trabecular cells:
- Definition: These cells help to structure the lymph node but are not primarily responsible for phagocytosis.
- Plasma cells:
- Definition: Derivatives of B cells that produce antibodies, enhancing the immune response but do not directly remove debris or bacteria.
- Pinocytic cells:
- Definition: Cells that take in substances by pinocytosis, a form of endocytosis; however, they are not the main players in debris removal.
- Germ cells:
- Definition: Typically refer to reproductive cells; not involved in lymph filtration.
In summary, phagocytic cells are the primary agents responsible for the clearance of bacteria and debris from lymph in lymph nodes.

Question 18: Which cells are actively involved in the removal of bacteria and debris from lymph?
- Correct Answer: Phagocytic cells
- Note: Understanding the role of these cells is critical for studying immune responses and lymphatic system function.