Immune System Definition

The structures, substances, and processes that protect the body from INFECTION. These include organs, tissues, cells, and molecules. The immune system functions in close collaboration with the NERVOUS SYSTEM and the endocrine system.

The main organs and tissues of the immune system include

The primary cells of the immune system include

For further discussion of the structures and functions of the immune system, please see the overview section “The Immune System and Allergies.”

See also ANTIBODYANTIGENANTIBODY-MEDIATED IMMUNITYB-CELL LYMPHOCYTECELL-MEDIATED IMMUNITYCOMPLEMENT CASCADEGRANULOCYTEIMMUNE RESPONSELYMPH NODE; LYMPHOCYTEMACROPHAGEMAJOR HISTOCOMPATIBILITY COMPLEX (MHC)MONOCYTENATURAL KILLER (NK) CELL; PSYCHONEUROIMMUNOLOGYT-CELL LYMPHOCYTE.

Immune system – what is and definition
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