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Lymph from the lymphatic system
While surrounding tissues it is called interstitial fluid. Once it enters the lymphatic system it is called lymphatic fluid.
The lymph capillary in the right arm channels excess fluid from plasma. This fluid flows in the direction of the lymph nodes in the axilla through larger lymphatic vessels where the fluid becomes lymph.
The lymphatic fluid is usually directly emptied into the lymphatic ducts.
lymphatic capillaries are very permeable Lymphatic capillaries have valves that keep fluid from flowing backward. The blood capillaries are regulated by smooth muscle. Lymphatic capillaries are also a but larger than blood capillaries.
· Although similar to blood capillaries, lymphatic capillaries differ structurally in the following ways: · The endothelial cells forming the walls of lymphatic capillaries are not tightly joined. Their edges loosely overlap one another, forming flaplike minivalves. The flaps, anchored by fine collagen fibers to surrounding structures, gape open when the fluid pressure is high in the interstitial space, allowing it to enter the lymphatic capillary. · Bundles of fine filaments anchor the endothelial cells to surrounding structures so that any increase in interstitial fluid volume separates the cell flaps, exposing gaps in the wall rather than causing the lymphatic capillary to collapse.
By the process of ultra-filtration. At the proximal end of the capillary, you have pressure of about 30 mm of mercury. So the fluid leaves the capillary and enter the interstitial compartment. At the distal end of the capillary the pressure is about 15 mm of Mercury. The fluid in drawn in due to oncotic pressure at that end.
The sequence of fluid flow is blood capillaries.... interstitial space or interstitial fluid..... lymphatic capillaries.... lymphatic vessels.... lymphatic ducts..... junction of the internal jugular and subclavian veins. Then what helps this whole sequence is the skeletal muscle pump and the respiratory pump.
fluid entering the capillary
The lymphatic system helps to maintain fluid balance, defend the body against disease, and absorb liquids from the intestine and transport them to the blood.The lymphatic system collects and returns fluid that leaks from blood vessels. It absorbs fats and vitamins. Lastly, it defends against invading microorganisms and disease.It contains a fluid with a composition similar to pancreatic fluidTo transport lymph.
Blood vessels come in three types: arterial, capillary, venous; and a fourth is the unidirectional flow of the lymphatic fluid in the lymph vessels.
during the exchange of gases in the tissues , some colorless fluid oozes out of the capillaries and fills the inter cellular spaces . this fluid is called interstitial or tissue fluid. It is the medium through which the exchange of gasses and food takes place. now some of this fluid enters the blind lymphatic capillary. as it has entered the lymph vessel then this fluid is now called lymph. the excess tissue fluid is returned back to the blood by this lymphatic system.