The lymphatic system is composed of a liquid (lymph), ship that carry the lymph, and organs the contain lymphoid tissue.

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Lymph is a fluid similar in composition to blood plasma. It is derived from blood plasma together fluids pass with capillary wall surfaces at the arterial end. As the interstitial fluid starts to accumulate, that is picked up and also removed by tiny lymphatic vessels and returned to the blood. As soon as the interstitial fluid enters the lymph capillaries, the is called lymph. Return the fluid to the blood stays clear of edema and also helps to maintain normal blood volume and pressure.

Lymphatic Vessels

Lymphatic vessels, uneven blood vessels, only carry fluid away from the tissues. The the smallest lymphatic vessels are the lymph capillaries, which start in the organization spaces together blind-ended sacs. Lymph capillaries are found in all regions of the body except the bone marrow, central nervous system, and also tissues, such together the epidermis, that lack blood vessels. The wall of the lymph capillary is composed of endothelium in i m sorry the an easy squamous cell overlap to form a straightforward one-way valve. This plan permits fluid to enter the capillary but stays clear of lymph from leaving the vessel.


The microscope lymph capillaries merge to form lymphatic vessels. Small lymphatic vessels join to type larger tributaries, called lymphatic trunks, i m sorry drain big regions. Lymphatic trunks merge until the lymph start the 2 lymphatic ducts. The appropriate lymphatic duct drains lymph from the upper ideal quadrant the the body. The thoracic duct drains every the rest.

Like veins, the lymphatic tributaries have thin walls and also have valves to protect against backflow of blood. There is no pump in the lymphatic device like the love in the cardiovascular system. The push gradients to move lymph through the vessels come from the bones muscle action, respiratory tract movement, and contraction that smooth muscle in courage walls.

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Lymphatic Organs

Lymphatic guts are characterized by swarm of lymphocytes and also other cells, such together macrophages, enmeshed in a framework of short, branching connective organization fibers. The lymphocytes originate in the red bone marrow with other varieties of blood cells and are lugged in the blood indigenous the bone marrow to the lymphatic organs. When the body is exposed come microorganisms and other international substances, the lymphocytes proliferate within the lymphatic organs and are sent in the blood come the website of the invasion. This is part of the immune response that make the efforts to damage the invading agent.