Different cells have different molecules presented on their surface to the immune system. These are often protein-based and enable the identification of:
-cells from other organisms of the same species
-abnormal body cells
The specific immune response is split into humoral immunity and cell-mediated immunity. Humoral is to do with the blood and antibodies. Distinguishing between an antigen and an antibody is very important.
Antigen = protein or carbohydrate foreign (not normally present) to a host’s organism
Antibody = protein made as a response to detecting an antigen which binds to the antigen and prevents the pathogen from harming the…