| A | B |
|---|
| plasma | the liquid part of blood, which is made mostly of water |
| diffusion | a type of passive transport within cells in which molecules move from areas where there are mor of them to areas where there are fewer of them |
| platelet | irregularly shaped cell fragments that help clot blood |
| capillary | blood vessel that connects arteries and veins |
| artery | blood vessel that carries blood away from the heart |
| vein | blood vessel that carries blood to the heart |
| lymph | fluid that has diffused into the lymphatic capillaries |
| enzyme | a type of protein that speeds up the rate of a chemical reaction in your body |
| antigen | complex molecule that is foreign to your body |
| antibody | a protein made in response to a specific antigen that can attach to the antigen and cause it to be useless |
| active immunity | long-lasting immunity that results when the body makes its own antibodies in response to a specific antigen |
| passive immunity | immunity that results when antibodies produced in one animal are introduced into another's body; does not last as long as active immunity |
| virus | tiny piece of genetic material surrounded by a protein coating that infects and multiplies in host cells |
| pasteurization | process in which a liquid is heated to a temperature that kills most bacteria |
| infectious disease | disease caused by a virus, bacterium, fungus, or protist that is spread from one person to another |
| noninfectious disease | disease that is not caused by a pathogen |
| allergen | substance that causes an allergic reaction |
| hemoglobin | a molecule in red blood cells that carries oxygen and carbon dioxide |
