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1.7 - Formation of Tissue fluid and Lymph - Coggle Diagram
1.7 - Formation of Tissue fluid and Lymph
How blood plasma becomes tissue fluid and lymph
Due to hydrostatic pressure water from the blood plasma is forced out of the capillaries into the tissue cells with dissolved nutrients and oxygen (this is called tissue fluid)
Tissue fluid has to return to the circulatory system to it will cause swelling like edema.
Most of the tissue fluid is returned into the capillaries by osmosis but about 10% drains into the lymph vessels where they end up re-joining the blood
Definitions
Hydrostatic pressure - the force of the heart contractions causes water from blood plasma to move out of the capillary into the body tissues
Edema - swelling from an injury or inflammation due to small vessels leaking fluid into nearby tissues
Lymphedema - build-up of fluid in soft body tissues when the lymph system is damaged o blocked
Pressure
Pressure is at its highest at the end of a capillary
Pressure is at its lowest at the venous end
net flow out of the capillary into tissues (10mm)
large hydrostatic pressure (35mm)
small osmotic pressure (25mm)
net flow into capillary (10mm)
small hydrostatic pressure (15mm)
large osmotic pressure (25mm)
Lymphatic system
excess fluid that had not been reabsorbed drains into the lymphatic system as lymph fluid
other functions
absorption and transportation of fats into the bloodstream
filtration of lymph through lymph notes as a part of the immune