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primary gland of the lymphatic system, located within the mediastinum, that helps to maintain the body's immune response by producing T lymphocytes


organ between the stomach and the diaphragm that filters out aging blood cells, and provide an environment for lymphocytes to initiate immune response


fluid that is circulated through the lymph vessels

lymph capillaries

microscopic vessels that draw lymph from tissues to the lymph vessels

lymph vessels

vessels that receive lymph from the lymph capillaries and circulate it to the lymph nodes


specialized lymph vessels in the small intestine that absorb fat into the bloodstream (lacteus=milky)


white or pale yellow substance in lymph that contains fatty substances absorbed by the lacteals

lymph nodes

many small, oval structures that filter lymph from the lymph vessels; major locations include the cervical, axillary, and inguinal regions

lymph ducts

collecting channels that carry lymph from the lymph nodes to the veins

right lymphatic duct

receives lymph from the right upper part of the body

thoracic duct

receives lymph from the left side of the head, neck, chest, abdomen, left arm, and lower extremities


process of disease protection induced by exposure to an antigen


a substance that, when introduced into the body, causes the formation of antibodies against it


a substance produced by the body that destroys or inactivates an antigen that has entered the body

active immunity

a long-lasting immunity that results from stimulating the body to produce its own antibodies; developed either naturally, in response to an infection, or artificially, in response to the administration of a vaccine

passive immunity

a short-lasting immunity that results from foreign antibodies that are conveyed either naturally, through the placenta to a fetus, or artificially, by injection of a serum containing antibodies

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