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The lymphatic system
belongs to the circulatory
system. The lymph system a
second pathway back to the
heart, parallel to the blood
·In contrast to the blood
circulation, which uses the
pumping of the heart to
circulate its flow, lymph is
propelled through the vessels
primarily by the rhythmic
contractions of tiny muscular
units (lymphangions).
·The lymphatic system has a
slow rhythm, low velocity and
low pressure.…read more

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Formation of Tissue Fluid
·Blood consists of cells bathed in a liquid plasma. When this plasma leaks out of the
capillaries, it is called tissue fluid.
·Tissue fluid is formed because of the high hydrostatic pressure of the blood at the
arteriole end of the capillary that pushes fluid out of the blood.
·The blood contains plasma proteins giving the blood a low water potential, tending to
draw water into the blood. Since the hydrostatic pressure has a greater effect than the
solute potential at the arteriole end, the net effect is that fluid leaves the capillary. No
blood cells or large proteins leave as they are too big to fit through the gaps.
·At the venule end of the capillary, since
ARTERIOLE end fluid has been lost, the hydrostatic
pressure of the blood is lower and the
water potential unchanged. Because of
this, fluid drains back into the blood. At
this stage, the useful materials such as
amino acids and glucose will have been
taken up by the cells and the reabsorbed
tissue fluid will now contain waste
VENULE end substances such as carbon dioxide and
urea.…read more

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Lymph/Tissue Fluid
The lymphatic system is of primary importance in
transporting fat from the intestines to the blood
stream, in removing and destroying interstitial
fluid(toxic substances), regenerating tissues and in
maintaining a healthy immune system.
·About 90% of the fluid which leaks out of
the capillaries seeps back in, the remaining
10% is returned to the blood by the
lymphatic system and is called lymph.
·This system is made up of many blind-
ending lymph vessels, which allow tissue fluid
to flow into them via one way valves. If tissue
fluid accumulates rather than be returned to
the blood by the lymphatic system, bloating
or oedema is the result.
·Lymph is virtually identical in composition
to tissue fluid and just has a different name
due to its different location.…read more

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· If not working properly, tissue fluid
builds in your tissues and causes swelling,
called lymphedema.
· Other lymphatic
system problems can include
infections, blockage,
and cancer.…read more


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