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What is opsonin
Chemicals which bind to pathogen and ‘tag'‘ them so are easily recognised by phagocytes and engulfed
What is the antibody structure
Binding site is 110 amino acids long on heavy and light chain called the variable region
Y shaped glycoproteins- immunoglobulins
Bind to specific antigens ‘lock and key’
Heavy chains is identical polypeptide chains and two shorter identical light chains
Chains held together by disulphide

What is neutralisation
Prevents pathogen from attaching to a host cell by blocking its binding site

What is agglutination
Pathogens are held together by a large antibody with many variable regions, so it is too large to enter a host cell

What is antitoxin
Binds to toxin made by pathogen, makes it harmless