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Ch 24 (A)
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15
Biology
9th Grade
04/30/2008

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Term
Macrophages
Definition
An amoeboid cell that moves through tissue fibers, engulfing bacteria and dead cells by phagocytosis.
Term
Nuetrophils
Definition
Term
Phagocytosis
Definition
A type of endocytosis involving large, particulate substances
Term
Inflammatory Response
Definition
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.
Term
Histamine
Definition
A substance released by injured cells that causes blood vessels to dilate during an inflammatory response
Term
Lymphatic system
Definition
A system of vessels and lymph nodes, separate from the circulatory system, that returns fluid and protein to the blood.
Term
Antigen
Definition
A foreign macromolecule that does not belong to the host organism and that elicits an immune response
Term
Active immunity
Definition
Term
Passive immunity
Definition
Term
Lymphocytes
Definition
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
Term
Humoral immunity
Definition
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.
Term
Cell-mediated immunity
Definition
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.
Term
B cell
Definition
A type of lymphocyte that develops in the bone marrow and later produces antibodies, which mediate humoral immunity
Term
T cell
Definition
A type of lymphocyte responsible for cell-mediated immunity that differentiates under the influence of the thymus
Term
Antibody
Definition
An antigen-binding immunoglobulin, produced by B cells, that functions as the effector in an immune response
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