lymphatic system

2 semi-independent parts of lymph. sys.

lymphatic vessels, lymphonoid tissues & organs

intersitial fluid once its entered lymphatic vessels

lymph

overall job:

returns interstitial fluid & leaked plasma protiens back to blood

3 functions:

homeostasis maintenence, transport fats, defend body

removing excess fluods & dissolved substances leaked from capillaries

homeostasis maintenence

from small intest. 2 bld stream

transports fats

filtering lymph & blood and exposing viruses & bact. to wbc

defends body

parts:

lymph, lymph nodes, thymus, spleen, network of lymph capill. & larger vessels

thin walled & narrow, permeable to intersit. flu, movement by pressure, pass thru nodes or glands, collect fluids & empties into large veins in upper chest by neck

lymph vessels

bean-shaped structures distributed along lymph vessels as a biological filter where lymph is forced thru

lymph nodes

accumulation of dead marcophages, infected cells & lymphocytes =

swelling

lymph starts as.

plasma

when extracelluar fluid leaves cells, it takes..

celluar waste products & protien cells

blood flowing into venule

90% of tissue fluid

lymph

10% of left overs of the tissue fluid

spleen, thymus gland & tonsils

acessory lymphoid organs

lymph is only filtered in..

lymph nodes

responsible 4 helping immature lymphocytes mature into t-cells

thymus

produces a hormone which stimulates maturing of lymphocytes in other lymph. organs

thymus

the thymus produces what hormone

thymosin

largest lymphoid organ

spleen

produces lymphocytes; filters blood,

not lymph

function of spleen

removes & destroys aged, damaged & abnormal rbc & plateltes whole retriving iron from hemoglobin

spleen and filtering

perolates thru spaces known as sinuses b4 draining into a sungle efferent draining vessel

what happens when the lymph enters lymph node