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8Sci CH12

8th Science CH12 Blood: Transport and Protection

TermDefinition
antibodies specific substances produced by white blood cells in response to specific antigens
antigens proteins or chemicals or just about any large molecules--such molecules on the surface of bacteria and parasites--that are foreign to the body
clotting process by which a broken blood vessel is sealed off by platelets, which release chemicals that react with substances in plasma and form sticky fibers that trap the blood cells--resulting in formation of a clot that seals the break and hardens into a scab
hemoglobin iron-clotting pigment that gives red blood cells their color
immunity occurs once your body produces a specific antibody to defend against a specific antigen, which protects you against the disease; can be acquired actively or passively
plasma liquid portion of your blood in which are suspended red and white blood cells and platelets;
platelets tiny, short-lived, non-nucleated, irregularly shaped cell fragments contained in blood which help to prevent serious bleeding from broken blood vessels by the process of clotting
red blood cells tiny, most numerous type of blood cell in whole blood
vaccine provides active immunity to a specific disease without having to get the disease first
white blood cells large, less numerous type of blood cell that fights bacteria, viruses, and other foreign substances