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Lymphatic system, Biology
As 'Middle man' of circulation it mediates exchange between blood and the tissue. It is also a collecting system like venous system.
Basically 'open type' circulation but also consists of thin walled lymphatic channels and lymphatic capillaries at some places.
Through out the body it is interwoven with blood vascular system except in the brain, spinal cord, cornea of eye and epidermis of skin.
4% of plasma protein filter out into tissue fluid per hour and is returned to blood only by the lymphatic system.
Consists of lymph sinuses, lymphatic channels, lymph hearts, and lymph nodes with lymph.
A general defect of defense system due to the malfunctioning or disorders of lymphatic organs is called Hodgkins disease.
Lymph is the fluid which enters lymphatic capillaries from the tissue, it constitutes 25% of total body weight.
Contains all the essential Gomponents of blood except RBC and some large protein molecules, which cannot filter out through endothelial wall.
It is the part of tissue fluid which in turn, is the part of plasma. It stores gases, water, salts and waste products.
Baird Hastings called lymph as the "sea within us".
Lymphatic Channels are non contractile thin-walled structures with numerous valves to prevent back flow of lymph.
In mammals all these channels finally lead to the thoracic duct (left and right) which posteriorly dilates as cisterna chyli and anteriorly opens into sub-clavian veins.
In intestinal villi is called as lacteals and in spleen called as cords of BiIlroth.
Aggregated lymphatic tissue forms node-like structures in certain parts of the body mainly at joints, and thoracic and abdominal walls for the formation of W.B.C.
Lymph nodes are the compact aggregated mass of lymphoid tissue abundant in mammals, act as 'biological filter'
to remove foreign bodies and worm out cells from body parts.
Called as Peyer's patches in intestinal wall and tonsils in pharyngeal wall.
Their larger versions are called as lymph organs/glands e.g. spleen, thymus etc.
Posted Date: 10/2/2012 3:22:19 AM | Location : United States
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