What function does the spleen serve in the immune system?

• A. It produces antibodies to fight infections
• B. It filters blood and helps produce white blood cells
• C. It stores red blood cells for emergencies
• D. It synthesizes clotting factors for wound healing

Answer: (B)

The spleen plays a crucial role in the immune system primarily by filtering blood and assisting in the production of white blood cells. It acts as a reservoir for blood and is involved in the removal of old or damaged red blood cells and pathogens from the bloodstream. Within the spleen, specific areas contain lymphoid tissue where lymphocytes, a type of white blood cell, are generated. These lymphocytes are essential for immune responses as they help identify and eliminate infectious agents and foreign substances.

By filtering blood, the spleen helps detect and respond to infections, thus playing a protective role in maintaining the body's homeostasis and defending against disease. This function is central to the immune response, as it ensures that the body has a continual supply of immune cells ready to respond to potential threats.