Lymphoid Organs: Specialized tissues where immune cells develop and mature.
Lymphocytes: White blood cells central to adaptive immunity, including T cells (cell-mediated immunity), B cells (antibody production), and natural killer (NK) cells (innate-like cytotoxicity).
Phagocytes: Cells that engulf and digest pathogens and debris; key types include macrophages and neutrophils.
Antigen-Presenting Cells (APCs): Cells such as dendritic cells and macrophages that process antigens and present them to T cells via MHC molecules, initiating adaptive responses.
Hematopoiesis: The process of blood cell formation in the bone marrow, producing all immune cell lineages.
Immune Surveillance: The immune system's continuous monitoring for abnormal cells or pathogens to maintain health and prevent disease.
1. What is a lymphocyte in the context of the immune system?
2. Which organs are classified as primary lymphoid organs, and what are their primary functions?
3. In which year was the complement system, a key component of innate immunity, first described in scientific literature?
Immune System Components — key organs?
Lymph nodes, spleen, thymus, bone marrow.
Lymphoid organs — types?
Primary and secondary lymphoid organs.
Innate Immunity — primary defense?
Physical, chemical barriers, and phagocytes.
Lymphocytes — role?
Adaptive immunity cells: T, B, NK.
Adaptive Immunity — memory feature?
Yes, it forms memory cells for faster response.
Phagocytes — function?
Engulf and digest pathogens.
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