What is the primary function of the spleen in the immune response?

• A. Production of red blood cells
• B. Filtration of blood and immune response
• C. Storage of platelets
• D. Regulating blood pressure

Answer: (B)

The primary function of the spleen in the immune response is its role in filtration of blood and contribution to immune activities. The spleen acts as a critical structure in the lymphatic system, where it filters blood, removing old or damaged red blood cells, and also plays a vital role in immune surveillance.

It contains specialized areas, such as the white pulp, which is rich in lymphocytes and is responsible for the immune response. Here, the spleen can recognize and respond to pathogens, activating immune cells, and producing antibodies. Thus, the spleen effectively supports the body's defense mechanisms by filtering pathogens from the bloodstream and facilitating interactions between immune cells.

In contrast to the other options, while the spleen does play roles in red blood cell management and storage, its primary involvement in the immune response emphasizes its function in blood filtration and immune activation, which is why it is integral to immune health and response.