Lymphatic system Flashcards
what is the lymphatic system
network of tissues and organs that help rid the body of toxins, waste and other unwanted materials.
what are the functions of the lymphatic system
Tissue drainage
Return of plasma and plasma proteins
Absorbed fat transport from gut
Immunity
how many litres of fluid in a day go back from extracellular spaces to the venous system
8L
what the composition of lymph
Lymph is fluid and plasma proteins only, but gains lymphocytes as it flows through Lymphatic capillaries and channels. Fats added in small intestine
what does flow in the lymphatic system rely on
relying upon muscle contraction, pressure changes and gravity. Unidirectional because of valves.
what occurs at lymph nodes
the immunological functions of lymph are located
lymphocytes are generated and matured
how many deep lymph nodes are there
450 lymph nodes in a young adult
what is a lymph node
lymphatic tissue surrounded by fibrous capsule
secondary lymphoid organ
acquired immunity
antigens in tissue fluid > into lymph, give immune response
Initially drainage is symmetrical from limbs, head and neck and trunk.
deep lymphatic drainage follows routes of arterial supply
hhh h
where do the large lymph ducts empty into
into the venous system at the Jugular/ Subclavian junction
Lymph returning from the small intestine is laden with absorbed fats, which will also drain to the Superior vena cava and eventually to the liver for absorption
fff
whats the spleen
largest lymphatic organUpper left quadrant of abdomen (peritonised)
whats the red and white pulp in the spleen
white - immune function, t + B cell maturation
red - erythrocytes
No lymph drainage from epithelium, cartilage, bone or central nervous system*, or from the majority of the spleen and liver.
hh
