Immunity and Lymphatic System Notes

The Lymphatic System Lymphoid Organs Tissues


1 Lymphatic vessels
2 Lymph fluid in vessels
3 Lymph Nodes

Lymphoid Organs Tissues
1 Spleen
2 Thymus
3 Tonsils
4 MALTS
5 PayersPatches
6 Appendix
7 Redbone marrow


lots of valves preventing
Lymphatic vessels backflow

Approx 3 liters of fluid perday is forced under
pressure out of BV

When fluid exits BV washes around tissues
it is called interstitial fluid Fluid must be
returned to blood system it's the lymphatic
system that accomplishes this Interstitial
fluid enters lymph vessels where name changes to
lymph fluid then cleaned up returned to bloodsystem

, Removal of Interstitial fluid from tissues spaces begins at
blind ended lymphatic capillaries that are found weaving btwn loose
connective tissue cells of body




Lymphatic capillaries are widespread in body but are Notfoundin

Bones Bone marrow
Teeth CNS fluid drains into CSF


Lymphatic capillaries are very permeable due to overlapping
endothelial cells that form value flaps in walls of vessels These
flaps only open inward

Endothelial cells are anchored to surrounding tissue by collagen
filaments this prevents vessels from collapsing inwards due to the
interstitial fluidpressure
Lymphatic capillaries can drain fluid proteins pathogens debris even
cancer cells from tissues of thebody As lymph fluid runs through

the lymphnodes is cleanedup before reentering theblood system
in of intestine

Set of specialized capillaries called lutea
9
Located in the villi of intestinal Mucosa Theyabsorb digestedFats FÑ
intestine turning theclear lymphfluid into a milky fatty fluidcalled chyle
Chyle is delivered tobloodsystem