The spleen is a primary lymphoid tissue.

Name: The spleen is a primary lymphoid tissue.
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The spleen is considered a secondary lymphoid organ because it does not participate in the formation of lymphocytes but rather filters the blood, removing old or damaged red blood cells and pathogens, and provides an environment for immune responses to antigens in the blood. Primary lymphoid organs, such as the bone marrow and thymus, are where lymphocytes are formed and mature.

The Spleen Is a Primary Lymphoid Tissue