What is the role of the spleen in the immune system?

• A. To produce red blood cells
• B. To filter blood and remove damaged cells while producing immune responses
• C. To store platelets and release them when needed
• D. To synthesize antibodies

Answer: (B)

The spleen plays a crucial role in the immune system by filtering the blood and removing damaged or old red blood cells, as well as pathogens and debris. It contains various types of immune cells, such as lymphocytes, which are essential for mounting an immune response. When the spleen detects antigens, it activates these immune cells to respond to infections, thereby playing a key role in both innate and adaptive immunity. The structure of the spleen allows it to effectively trap and process foreign substances, making it an integral part of the body’s defense mechanism.

Regarding the other options, the spleen does not produce red blood cells, which primarily occurs in the bone marrow. While it has some storage capacity for platelets, this is not its main function, and it does not synthesize antibodies directly; rather, it facilitates the production of immune responses that involve antibodies through the action of lymphocytes. Therefore, the choice highlighting its role in filtering blood and producing immune responses accurately reflects the spleen's functions in the immune system.