lymphatic system Flashcards
how much interstitial fluid is drained into the lymphatic system a day
32L
what are the 3 functions of the lymphatic system
drainage, transport, protect
how does the lymphatic system drain
drains tissue spaces of excess interstitial fluid and return it to the CV system
how does the lymphatic system transport
transports dietary lipids and lipid-soluble vitamins (A,D,E and K) from the GI tract to the blood
how does the lymphatic system protect
protects from foreign cells, microbes and cancer cells through immune responses
describe lymphatic capillaries
slightly larger than blood capillaries
close ended
pressure in tissue forces fluid into them
describe overlapping endothelial cells
acts like a one way valve so fluid can not flow out
found throughout body ecxept CNS, bone narrow, portions of spleen and avascular tissue
what causes lymph to flow
muscle contractions
1 way valves
respiratory pressure
smooth muscle contraction in lymph vessel wall
name the lymphatic organs
thymus, red bone marrow, lymph nodes, spleen, lymphatic nodules
which lymphatic organs are primary organs
thymus and red bone marrow
which lymphatic organs are secondary organs
lymph nodes
spleen
lymphatic nodules
what is the structure of the thymus
two lobed organ
where is the thymus
between lungs, above heart
what is the function of the thymus
immature T cells migrate from bone marrow to cortex of thymus where they multiply and mature
what shape are lymph nodes
bean shaped
how many lymph nodes are throughout the body
roughly 600
where are lymph nodes most concentrated
mammary glands, axillae and groin
what do lymph nodes contain
plasma cells, mature B-cells, T-cells, dendritic cells and macrophages
what do lymph nodes do
filter lymph and trap foreign substances
explain the spleens structure
oval, largest single mass of lymphoid tissue
where is the spleen
on LHS between stomach and diaphragm
what types of pulp is the spleen made of
white and red
describe white pulp
lymphocytes and macrophages surrounding central arteries
describe red pulp
blood filled venous sinuses and splenic cords with RBC, macrophages, lymphocytes, plasma cells and granular leukocytes
what does red pulp do
destroys worn or defective blood cells and platelets
stores platelets
production of blood cells in foetal life
what shape are lymphatic nodules
egg shaped
what are lymphatic nodules
lymphatic tissue in mucous membranes lining, found in GI tract, urinary tissue
