Answer:
The human immune system consist of lymphoid organs, tissue
cells and antibodies. The immune system recognizes foreign antigens and
generates an immune response and remembers them.
An immune response is the way in which the human body
responds to invasion of specific pathogens or antigens. These response involve
the production of cells (lymphocytes) and chemicals (antibodies), that are
designed to defend the body against the pathogens.
Antigens are substances that can activate an immune
response. Antigens trigger the production of antibodies (glycoprotein?s or immunoglobulin?s)
by the immune system. Each type of antibody is specific to a particular antigen
and reacts with it to render it harmless.
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