Antibodies - Proteins with specific binding sites made by B cells., Heavy chain - Part of an antibody which is longer, Light chains - Part of an antibody which is shorter, Antigen-antibody complex - Where an antibody and an antigen join together a a binding site., Variable region - Part of an antibody which is different for each antibody., Agglutination - The clumping together of baterial cells due to antibodies., Passive immunity - Produce by the introduction of antibodies into individuals from an outside source., Active immunity - Is produced by stimulating the production of antibodies by the individuals' own immune system., Natural active immunity - Results from an individual becoming infected with a disease under normal circumstances., Artifical active immunity - Formed due to vaccination, where you become immune without suffering from a disease., Vaccination - the introduction of a dead or weakened pathogen into the body to induce artifical immunity., Herd Immunity - occurs when a large portion of a community (the herd) becomes immune to a disease, making the spread of disease from person to person unlikely., Antigenic Variability - Occurs when a pathogen mutates so the structure of the antigen changes.,

A Level Biology Chapter 5- 5.5+5.6

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