lymphatic, immune LO's Flashcards
define lymph
Tissue fluid formation
BP in capillaries forces H2O & small molecules out of the vessels
This fluid becomes lymph
lymph function
Vessels in the small intestine absorb dietary fats & deliver them to bloodstream
Collects excess interstitial fluids & delivers it to bloodstream
Delivers foreign particles to lymph nodes to be filtered out
lymphatic pathway
: Capillaries → afferent vessels → nodes → efferent vessels → trunks → collecting ducts → subclavian veins
define and function capillaries
microscopic closed ended tubes
function:
in interstitial spaces of most tissues
skin has a lot → if it is broken, foreign substances can enter the lymphatic system quickly
define vessels:
walla re similar but thinner than the veins, ans also have valves
function:
. larger vessels lead to lymph nodes and then to larger lymphatic trunks
define trunks:
drain lymph from lyphatic vessels
function: named for the regions they serve
drains lymph from the upper right side of the body (25%)
rt lymphatic
drains lymph from the rest of the body (75%)
lft lymphatic
lymphatic flow
Forced into vessels by hydrostatic pressure of ECF
Lymph is pumped up towards the collecting ducts through the vessels
skeletal muscle contractions, pressure changes of breathing, valves, & contraction of smooth muscle in larger lymphatic vessels all aid the flow against gravity
Widely distributed throughout the body in groups along lymph vessels
lymph node
lymph node strucutre
afferent vessels
sinuses
efferent vessels
nodules definiton
where the new lymphocytes are produced
lymph node function
filters lymph
protection against pathogens (lymphocytes- B cells & macrophages)
areas of lymphocyte maturation
e. Location- more frequent in cervical, axillary, & inguinal regions
spleen function
filters blood, blood storage
b cells divide nad produce antibodies
thymus location
superior to the heart
non specific resistance against disease
protection against all pathogens adn foregin substances
