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Lymphatic System
a one way system
a secondary transport system
Functions of Lymphatic System
returns tissue fluid to the blood
defends the body against infection
transports fat
Lymph Nodes
swellings in the lymph vessels
filter bacteria
store lymphocytes (white blood cells), some of these kill microorganisms and others produce antibodies
Tissue Fluid
is plasma without red blood cells, platelets or large proteins
surrounds all body cells and helps transport materials in and out of cells
Tissue Fluid Returns to the Plasma
most enters blood capillaries
some enters dead-ending lymph vessels, where it is called lymph
Lymph
is made from tissue fluid
contains white blood cells, proteins and fats
Lymph Moves in Lymph Vessels
muscles in the vessel walls
general body movement
Valves
control the direction of lymph flow
Subclavian Vein
lymph returns to the blood through this vein, located near the collar bones
