What is the primary function of the spleen?

The primary function of the spleen is to filter blood and assist in the immune response. The spleen plays a crucial role in the body's immune system by identifying and removing old or damaged red blood cells and pathogens, such as bacteria and viruses. It contains white blood cells that help fight infections and produce antibodies, making it an integral part of the body's defense mechanism.

Additionally, the spleen acts as a reservoir for blood, storing platelets and white blood cells until they are needed. This storage function also supports the body's ability to respond quickly in times of need. While the spleen may have some involvement in the production of certain blood cells, its primary roles center on filtration and immunological functions, which are essential to maintaining overall health and combating illness.