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. In which year was the complement system, a key component of innate immunity, first described in scientific literature?
3. What is the primary role of adaptive immunity processes?
Immune System Components — key organs?
Lymph nodes, spleen, thymus, bone marrow.
Innate Immunity — primary defense?
Physical, chemical barriers, and phagocytes.
Adaptive Immunity — memory feature?
Yes, it forms memory cells for faster response.
Lymphoid organs — types?
Primary and secondary lymphoid organs.
Lymphocytes — role?
Adaptive immunity cells: T, B, NK.
Phagocytes — function?
Engulf and digest pathogens.
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