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regresses considerably with age


largest lymphatic organ; red and white pulp

lymph nodes

bean shaped; has efferent and afferent vessels

red bone marrow

primary lymphatic organs


primary lymphatic organs

lymph nodes

secondary lymphatic organs


secondary lymphatic organs


secondary lymphatic nodules associated with nasal and oral cavities


secondary lymphatic nodules located in connective tissue of mucous membranes

peyer's patches

secondary lymphatic nodules located in the small interstine

lymph nodes

filter lymphs


filters blood and contains red and white pulp


Program T cells for immunocompetence

red bone marrow

Program B cells for immunocompetence


fluid becomes interstitial fluid

interstitial fluid

fluid becomes lymph


interstitial fluid plus blood cells and large proteins

cisterna chyli

sac-like vessel

thoracic duct

left lymphatic duct

lymphatic vessels

merge to form lymphatic trunks

lymphatic trunks

merge to form lymphatic ducts

cisterna chyli

the thoracic duct begins here

thoracic duct

drains the legs, abdominal area, and left side of the body

lymphatic duct

drains the right side of thorax, arm, head, and neck

thoracic duct

longer lymphatic duct

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