lymphatic system Flashcards
(38 cards)
what is the lymphatic system
a complex series of lymph capillaries lymphatic trunks lymphoid organs lymph nodes lymph ducts and lymphatic tissue that produce and transport lymph fluid from tissues to the circulatory system
what is the lymph system a major component in
immune system
what are the 3 parts of the lymphatic system
- conducting system (lymphatics)
- lymph
- lymph nodes
what is the conducting system
a meandering network of lymphatic vessels which are 1 way flowing towards the heart and using peristalsis there are capillaries collecting ducts trunks
what is important about lymph fluid
has large proteins therefore can clot does not contain RBC or platelets
how do plasma ECF lymph connect
plasma seeps out of blood capillaries to bathe cells and exchange materials
some return to capillaries at distal portion having exchanged materials
some remain in the intercellular spaces and enter the lymphatic capillaries
what doe lymphatic vessels include
- Lymphatic capillaries
– Lymphatic collecting vessels
– Lymphatic trunks & ducts
differences of lymph capillaries to blood capillaries
very permeable take up cell debris pathogens and cancer cells
endothelial cells overlap to form 1 way minivalves and are anchored by collagen filaments preventing collapse
they are not in the bones teeth bone marrow or CNS
what are lacteals
specialised lymph capillaries present in intestinal mucosa
what is the function of lacteals
absorb digested fat and deliver fatty lymph to the blood
what caused oedema
tissue fluid build up the tissue will swell
what is lymph in the intestinal mucosa called
chyle
how are fats transported in lymph
fats are passed on to the lymphatic system to be transported to the blood circulation via the thoracic duct
how do lymphatic collecting vessels differ from veins
have thinner walls with more internal valves
anastomose( cross connection ) more frequently
how are nutrients supplies in the lymphatic collecting vessels
vasa vasorum
how are lymphatic trunks formed
formation of the largest collecting ducts
name 5 Lymphatic Trunks
paired lumbar paired Broncho mediastinal paired subclavian paired jugular trunk single intestinal trunk
name the two main ducts
right lymphatic duct
thoracic duct
what does the right lymphatic duct drain
drains the right arm and the right side of the head and thorax
what does the thoracic duct drain
arises from the cisterna chylic and drains the rest of the body
where do these ducts empty there lymph
jugular and subclavian vein on there sides of the body
how is lymph transport propelled
pulsation of nearby arteries
contraction of smooth muscle in the walls of the lymphatics
what are the two main types ogf lymphoid cell
t cells and b cells
what do t cells do
manage the immune response attack and destroy foreign cells
