The
lymphatic system is composed of
lymphoid tissues and organs,
lymphoid vessels and a circulating fluid called
lymph. It is involved in fluid balance, circulation and
immunity. The
lymphatic system is found through the entire body in an extensive network of vessels,
tissues and
organs to carry the circulating
lymph.
Lymphatic vessels return fluid to the
blood system after it has been "lost" at the arterial end of
capillaries due to
blood pressure. The
lymphoid tissues and
organs contain
leukocytes;
white blood cells that are specialized in
immunity.
Lymph and fluid balance
The
lymph has the same composition as
interstitial fluid. It passes through
lymph nodes, which can respond appropriately if there are any circulating
pathogens in the
lymph.
About 3L of fluid is leaked at
capillary beds each day. The
lymphatic system returns the excess fluid to the venous circulation. If the
lymphatic system is damaged, blocked or otherwise unable to return the fluid to the venous
system edema results.
Edema is an excessive buildup of fluid resulting in swelling.
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1 - Anatomy and Physiology Basics