Immune System and Related Concepts

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Histamine

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A substance that increases blood flow to the injured areas after cells are injured. Which increases permeability of surrounding capillaries.

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Phagocyte

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White blood cells that ingest and destroy foreign matter such as pathogens.

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Neutrophil

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Large leukocyte that contains a lobed nucleus and many cytoplasmic granules; also the most common phagocyte in the body.

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Macrophage

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White blood cell that engulfs pathogens and other materials.

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105°F

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Temperature at which a human is facing possible death.

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Interferon

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A protein released by cells infected with viruses that enable nearby cells to resist the viral infection.

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Lymphocytes

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Exist in two forms: T and B cells.

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B cells

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White blood cells that are made in the bone marrow and complete their development in the spleen; make antibodies.

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T cells

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White blood cells that are made in the bone marrow but complete their development only after traveling to the thymus; also participate in the immune reaction.

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Cytotoxic T cells

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White blood cells that attack pathogen infected cells.