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| An amoeboid cell that moves through tissue fibers, engulfing bacteria and dead cells by phagocytosis. |
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| A type of endocytosis involving large, particulate substances |
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| A line of defense triggered by penetration of the skin or mucous membranes, in which small blood vessels in the vicinity of an injury dilate and become leakier, enhancing the infiltration of leukocytes; may also be widespread in the body. |
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| A substance released by injured cells that causes blood vessels to dilate during an inflammatory response |
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| A system of vessels and lymph nodes, separate from the circulatory system, that returns fluid and protein to the blood. |
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| A foreign macromolecule that does not belong to the host organism and that elicits an immune response |
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| A white blood cell. The lymphocytes that complete their development in the bone marrow are called B cells, and those that mature in the thymus are called T cells |
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| The type of immunity that fights bacteria and viruses in body fluids with antibodies that circulate in blood plasma and lymph, fluids formerly called humors. |
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| The type of immunity that functions in defense against fungi, protists, bacteria, and viruses inside host cells and against tissue transplants, with highly specialized cells that circulate in the blood and lymphoid tissue. |
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| A type of lymphocyte that develops in the bone marrow and later produces antibodies, which mediate humoral immunity |
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| A type of lymphocyte responsible for cell-mediated immunity that differentiates under the influence of the thymus |
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| An antigen-binding immunoglobulin, produced by B cells, that functions as the effector in an immune response |
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