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B cell

lymphocyte that originates and matures in the red bone marrow and produces antibodies, which bond to pathogens and neutralize them

interstitial fluid

liquid that surrounds cells in the body; all fluid outside the body's cells


lymphatic capillary located in the villi of the small intestine, which absorbs fats


colorless interstitial fluid that travels through lymphatic vessels and contains white blood cells, which help fight infection

lymph node

small, bean-shaped organ of the lymphatic system that filters lymph throughout the body and traps circulating pathogens

lymphatic capillary

tiny, thin-walled vessel located in the spaces between cells (except in the central nervous system and nonvascular tissue) that serves to drain and process interstitial fluid

lymphatic system

system of organs and cells that returns fluid to the bloodstream and stores and circulates fluids involved in immune response

lymphatic vessel

vessel of the lymphatic system that is distributed throughout the body and carries lymph


specific type of leukocyte that includes several different types of specialized immune cells, all of which are primarily found in lymph (interstitial fluid that has entered the lymphatic system)


white blood cell that digests other body cells

red bone marrow

tissue in flat bones and spongy tissue in long bones where blood cells are formed and where some mature


largest lymphoid organ, found in the abdominal cavity beneath the diaphragm and near the stomach, which filters blood and stores monocytes

T cell

lymphocyte that originates in red bone marrow, matures in the thymus, and produces enzymes that kill infected cells


organ located just below the sternum that is involved in immune response and is the location where T cells mature


one of two lymphoid organs located in the back of the throat that trap inhaled or swallowed pathogens