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18 terms

chap14 lymphatic system

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Purpose of Lymphatic System
1. To turn tissue fluid to the blood to maintain blood volume. 2. To protect the body against pathogens and other foreign material.
lymph
is the name for tissue fluid that enters lymph capillaries
lymph vessels
begins as dead-end lymph capillaries found in most tissue spaces; collect tissue fluid and proteins.
lymph nodes
encapsulated masses of lymphatic tissue
lymph nodules
small unencapsulated masses of lymphatic tissue
spleen
located in the upper left abdominal quadrant behind the stomach
thymus
inferior to the thyroid gland; in the fetus and infant the thymus is large with age the thymus shrinks
lymphocytes
-produced in red bone marrow. - migrate to the LN, spleen, thymus
B cells
in the embryo are produced in the thymus and RBM; migrate to the spleen. lymph nodes, and nodules.
T cells
in the embryo are produced in the thymus and RBM; they require the hormones of the thymus for maturation; migrate to the spleen, lymph nodes, and nodules.
cell-mediated immunity
does not involve antibodies; is effective against intracellular pathogens, malignant cells, and grafts of foreign tissue.
humoral immunity (adaptive)
is specific and is carried out by lymphocytes and macrophages.
active vs. passive immunity
active: production of one's own antibodies. passive: antibodies from another source
natural vs. artificial immunity
natural: recovery from a disease, with production of antibodies and memory cells. artificial: a vaccine stimulates production of antibodies and memory cells
genetic vs. acquired immunity
genetic: does not involve antibodies; is programmed in DNA acquired: does involve antibodies
antigen
are chemical marker that identifies cells.
immunity
is the body's ability to destroy pathogens or foreign material and to prevent further infections diseases
innative vs adaptive immunity
innative : is nonspecific, responses are always the same, does not create memory, and does not become more efficient. adaptive: is very specific, may involve antibodies, does create memory, and responses become more effcient