Humoral immunity is when protective substances are released into the blood plasma. Cellular immunity is immunity through lymphocytes.
The release into the blood plasma of specific protective proteins formed by B-lymphocytes – antibodies, or immunoglobulins, served as the basis for calling this type of immune defense humoral (from lat. Humor – liquid). Due to the correspondence of the spatial form of the molecules of the antibody and antigen (as a key to the castle), the antibody attaches to the antigen, inhibits its activity and destroys.
With cellular immunity, the entire cell participates in protecting the body, making direct contact of the lymphocyte with the antigen and its subsequent destruction. This ability has a variety of lymphocytes T-killers. Antibodies with cellular immunity are not formed.
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