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Ch. 12 Part II Vocab
Vocabulary
Term | Definition |
---|---|
Immune System | The body’s defenders against these tiny but mighty enemies are two systems, simply called the innate and the adaptive defense systems. Together they make up the immune system. |
Innate Defense System | Also called the non-specific defense system, responds immediately to protect the body from all foreign substances, whatever they are. |
Non-Specific Defense System | Response immediately to protect the body from all foreign substances, whatever they are. |
Immunity | The ability of the body to resist many agents that can cause disease; resistance to disease. |
Pathogens | Disease-causing microorganism. |
Lysozyme | An enzyme found in seat, saliva, and tears that is capable of destroying certain kinds of bacteria. |
Natural Killer Cells | Roam the body in blood and lymph. They are a unique group of aggressive lymphocytes that can lyse and kill cancer cells, virus-infected body cells, and some other non-specific targets well before the adaptive arm of the immune system is enlisted in the f |
Inflammatory Response | A physiological response of the body to tissue injury; includes dilation of blood vessels and increased blood vessel permeability. |
Histamine | A substance that causes vasodilation and increased vascular permeability. |
Kinins | Group of polypeptides that dilate arterioles, increase vascular permeability, and induce pain. |
Diapedesis | The passage of blood cells through intact vessel walls into the tissues. |
Pus | The fluid product of inflammation composed of white blood cells, the debris of dead cells, and a thin fluid. |
Phagocytes | Cell capable of engulfing and digesting particles of cells harmful to the body. |
Antimicrobial Proteins | Enhance the innate defenses either by attacking microorganisms directly or by hindering their ability to reproduce. |
Complement | A group of plasma proteins that normally circulate in inactive forms; when activated by complement fixation , causes lysis of foreign cells and enhances phagocytosis and inflammation. |
Complement Fixation | Occurs when complement proteins bind to certain sugars or proteins on the foreign cell’s surface. |
Membrane Attack Complex | Produce lesions, complete with holes, in the foreign cell’s surface. These lesions allow water to rush into the cell, causing it to burst. |
Interferons | Although the virus-infected cells in an infected person can do little to save themselves, they help defend cells that have not yet been infected by secreting small proteins called interferons. |
Fever | Abnormally high body temperature, is a systemic response to invading microorganisms. |
Pyrogens | Chemicals secreted by white blood cells and macrophages exposed to foreign cells or substances in the body. |
Immune Response | Antigen-specific defenses mounted by activated lymphocytes. |
Humoral Immunity | Also called antibody-mediated immunity, weak bond in which a hydrogen atom forms a bridge between two electron-hungry atoms. An important intramolecular bond. |
Cellular Immunity | or cell-mediated immunity, Immunity conferred by lymphocytes called T cells; also called cell-mediated immunity. |
Antigen | Any substance-including toxins, foreign proteins, or bacteria-that, when introduced to the body, is recognized as foreign and activated the immune system. |
Self-Antigens | Do not trigger an immune response in us, they are strongly antigenic to other people. |
Hapten | or -incomplete antigen, the troublesome small molecule. |
Penicillin Reaction | Perhaps the most dramatic and familiar example of a drug hapten’s provoking an immune response involves the binding of penicillin to blood proteins |
B Lymphocytes | or B cells, lymphocytes that oversee humoral immunity; their descendants differentiate into antibody-producing plasma cells; also called B lymphocytes |
T Lymphocytes | or T cells, Lymphocytes that mediate cellular immunity; include helper, cytotoxic, regulatory, and memory cells. Also called T lymphocytes. |
Immunocompetent | The ability of the body’s immune cells to recognize specific antigens; reflects the presence of plasma membrane bound receptors. |
Antigen -Presenting Cells | (APCs) In immunity is to engulf antigens and then present fragments of them, like signal flags, on their own surfaces where they can be recognized by T cells. |