BSC 300 Lecture Notes - Lecture 26: Natural Killer Cell, Innate Immune System, Adaptive Immune System

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The cells of the immune system engage in molecular screening to recognize and eliminate foreign molecules. All plants and animals possess an innate immune system that recognizes and responds to pathogens in a generic way. Vertebrates also possess an acquired immune system, (aka the adaptive immune system) Immunological memory that enhances response to subsequent encounters with an invading pathogen or foreign substance. Creates immunological memory in the form of antibodies after an initial response to a specific pathogen. The antibodies will recognize the foreign pattern upon future infection and stimulate immune cells to attack the invading particles. Leukocytes: white blood cells : born from hematopoietic stem cells of the bone marrow and differentiate into either myeloid or lymphoid lineages. Myeloid: mediate innate immune responses along with natural killer cells of the lymphoid lineage. Lymphoid: (t cells, b cells, natural killer cells and plasma cells) mediate the acquired immune response.

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