BIO 106 Lecture Notes - Innate Immune System, Adaptive Immune System, Natural Killer Cell
22 Jul 2022
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Nearly everything in the environment teems with pathogens, agents that cause disease. The immune system is the body"s system of defenses against agents that cause disease. Innate immunity is a series of defenses that: Are the same whether or not the pathogen has been encountered before. Invertebrates rely solely on innate immunity, which may consist of: Immune cells capable of phagocytosis, cellular ingestion and digestion of foregin substances. Barriers such as skin and mucous membranes. Interferons, proteins produced by virus-infected cells that help to limit the cell-to-cell spread of viruses. Macrophages, large phagocytic cells that wander through the interstitial fluid. Natural killer cells, which attack cancer cells and virus-infected cells. A complement system, a group of about 30 kinds of proteins that can act with other defense mechanisms immunity, which can: Tissue damage triggers the inflammatory response, a major component of our innate. Limit the spread of infection to surrounding tissues. Inflammation may be localized or widespread (systemic)
