Bone marrow - Where all blood cells, including immune cells, are produced., Thymus - An organ located in the chest that helps T cells mature., Spleen - An organ located in the abdomen that filters blood, removes old cells, and stores immune cells., Lymph nodes - Bean-shaped organs located throughout the body that contain immune cells and filter lymph fluid., Phagocytes - White blood cells that engulf and destroy foreign invaders., Lymphocytes - White blood cells that are involved in the adaptive immune, B cells - Produce antibodies that can bind to specific pathogens and help destroy them., T cells - Orchestrate the immune response and directly attack infected cells., Antibodies - Proteins produced by B cells that can bind to specific pathogens and help destroy them., Innate immune system - This is the body's first line of defense. It is present at birth and provides a general, non-specific response to any foreign invader., Adaptive immune - a system that develops over time as the body is exposed to different pathogens, Skin - is the body's largest organ and acts as a physical barrier against pathogens., Immune  system - is a complex network of cells, tissues, and organs that work together to defend the body against diseases,

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