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Protect the body against both infectious disease and foreign invaders.

Bind to specific antigens, tagging them for attack by other elements of the immune system.

Release histamine and other chemicals during inflammatory and allergic reactions.

Ingest and digest pathogens and dead or damaged cells through phagocytosis.

Carry out a variety of immune responses, including killing infected cells and activating other immune cells.

Produce antibodies to neutralize antigens and remember pathogens for faster response upon re-exposure.

Phagocytose pathogens and release enzymes and antimicrobial proteins to kill them.

Capture antigens and present them to T cells, acting as messengers between the innate and the adaptive immune systems.

Destroy compromised host cells, such as tumor cells or virus-infected cells.

Consists of proteins that enhance the abilities of antibodies and phagocytic cells to clear pathogens.

Display peptide fragments for recognition by T cells, enabling the immune system to detect infected cells.

Proteins secreted by immune cells that act as chemical messengers to guide the immune response.

Cytokines that interfere with viral replication and activate immune cells.

Assist other cells in the immune response by secreting cytokines and providing additional activation signals.

Kill virus-infected cells and tumor cells by inducing apoptosis.

Help control the immune response by maintaining tolerance to self-antigens and preventing autoimmune disease.

Facilitates the movement of immune cells and aids in the removal of foreign materials and waste from the body.

Filters blood, recycles old red blood cells, and helps mount an immune response to blood-borne pathogens.

Site of T cell maturation and differentiation.