lymphatic system Flashcards
what is included in the term “lymphatic tissues and organs”
tonsils, lymph nodes, spleen and thymus
what is the main function of the lymphatic system
drainage of body fluids and return of them to the bloodstram
what is lyphedema
accumulation of interstitial fluid in lymph sys
where does lymph drain back into blood
junction of jugular and subclavian veins
where is there no lymph
brain and bone
what cells make up lymph tissue
endothelial cells
what are lymphatic capillaries in GI
lacteals
which duct drains themost fluid
thoracic duct
what kinds of cells are in lypmh
immune cells which arise from haematopoietic stem cells
write a note on B, T and NK cells
B-> express receptors which bind to antigens on pathogens. can differentiate into plasma cells which secrete antibodies
T-> dont secrete anitbody- secrete soluble factors
NK-> have cytotoxic granules- defense against viruses and certain cancer
what are the Primary and secondary lymphoid organs
primary: bone marrow and thymus gland.
secondary: lymphnode spleen and mucosa associated lymphoid tissue.
what is an immature t cell
thymocyte and matures in the thymus
describe structure of thymus gland
2 lobes: corpsucles separated into even smaller lobes by trabeculae (connective tissue)
outer cortex contains Immature T cells (thymocytes) as well as an inner medulla
write a note on lymph nodes
small and bean shaped . external connective tissue capsule. interior divided into outer and inner medulla. trabeculae in cortex. w
afferent lymph vessel: lymph flows in
reticular network: traps pathogens
leukocytes and dendritic cells eliminate pathogens.
efferent lymph vessels: clean lymph leaves at hilum
what is a germinal center
dividing B cells surrounded by T cells
