The Spleen's Critical Role in Immunity

Key Immune Functions

1. Blood Filtration: Removes old/damaged RBCs, pathogens, foreign particles.
2. RBC Reservoir: Releases stored red cells during hemorrhage or hypoxia.
3. Lymphocyte Production/Maturation: B cells and T cells develop here.
4. Antibody Production: Splenic B cells secrete pathogen-specific antibodies.
5. T-Cell Activation/Proliferation: Environment for cell-mediated immunity.
6. Antigen Presentation: Macrophages/dendritic cells present antigens to T cells.
7. Memory Cell Generation: Long-lived B and T memory cells for faster future responses.

The spleen integrates filtration, cellular immunity, and humoral immunity, making it indispensable for defense against infection.