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Download Lymphatic System Terms Edema- an abnormal accumulation of fluid
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Lymphatic System Terms Edema- an abnormal accumulation of fluid in body parts and tissue; causes swelling lymphatic vesselslymph- the watery fluid in the lymph vessels collected from tissue space; only flows towards the heart. lymphatic collecting vessels- Large lymphatic vessels that transfer lymph from lymphatic capillaries to ducts right lymphatic duct- Duct that drains lymph from the right arm, right side of the head, and thorax. thoracic duct- Duct that receives lymph form the rest of the body not being drained by the thoracic duct. lymph nodes- a mass of lymphatic tissue lymphocytes- angular white blood cells formed in bone marrow that mature in lymphoid tissue; trap foreign substances. cortex- the outer surface area of an organ follicles- collections of lymphocytes found in the cortex germinal centers- dark staining centers of follicles that enlarge when lymphocytes/B-cells generate daughter cells called plasma cells plasma cells- daughter cells generated in germinal centers that release antibodies medulla- the inner region of an organ or tissue afferent lymphatic vessels- Convex side of a lymph node in which lymph enters efferent lymphatic vessels- Convex side of a lymph node in which lymph leaves; forms hilus hilus- Indented area in a lymph node formed by efferent lymphatic vessels in which lymph exits spleen- Blood rich organ that filters blood located on the left side of the abdominal cavity and extends around the anterior aspect of the stomach thymus gland- Lymphatic mass that produces thymosin which program lymphocytes to do their protective roles; located in the throat overlying the heart tonsils- Small masses of lymphatic tissue that ring the pharynx that trap and remove foreign pathogens from the throat Peyer's patches- Small masses of lymphatic tissue found in the walls of the small MALT (Mucous-associated lymphatic tissue)- Acts a sentinel to protect the upper respiratory and digestive tracts from attacks of foreign matter entering cavities (Tonsils and Peyer’s Patches) nonspecific defense system- System that responds immediately to protect the body from foreign substances, whatever they are specific defense system (immune system)- System that mounts attack on particular foreign substances antigen- Any substance that when introduced to the body, is recognized as foreign and activates the immune system pathogen- disease causing microorganism (e.g. Virus, bacteria, fungi) phagocytes- Cell capable of engulfing and digesting particles or cells harmful to the body NK cells- Lymphocytes that can lyse and kill cancer cells and virus-infected body cells before triggering the immune sytem perforins- a protein, released by killer cells of the immune system, that destroys targeted cells by creating lesions like pores in their membranes. inflammatory response- Nonspecific response triggered when tissue is damaged 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, debris of dead cells, and thin fluid. interferons- Small protein secreted by virus infected cells to defended non-infected cells pyrogens- an agent or chemical substance that includes fever humoral immunity- Provided by antibodies in the body’s humors or fluids cell-mediated immunity- Immunity when lymphocytes defend the body B cells- Cells that produce antibodies and oversee humoral immunity T cells- Lymphocytes that mediate cellular immunity; include helper, killer, suppressor, and memory cells. macrophages- Cells important in the immune response as an antigen presenter to T and B cells; abundant in lymphatic and connective tissue.