Tonsils - Trap and respond to pathogens that enter through the mouth and nose., Thymus - Produces thymosin that stimulates production of T-lymphocytes., Spleen - Houses lymphocytes for immune response and phagocytes that remove debris from blood., Lymph nodes - Store lymphocytes and macrophages which destroy foreign material in lymph fluid., Lymph vessels - Transport lymph fluid throughout the system., Bone marrow - Produces stem cells which specialise into lymphocytes, macrophages and neutrophils., Peyer's patches - Prevent growth of pathogenic bacteria in the gut. Located in ileum., Appendix - Houses immune system cells that protect good bacteria in the gut. ,

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