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8Sci CH12
8th Science CH12 Blood: Transport and Protection
| Term | Definition |
|---|---|
| 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 |
Created by:
djhockett5
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