Lymphatic system, Biology

LYMPHATIC SYSTEM

  • 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.

1959_lymphatic system.png

Posted Date: 10/2/2012 3:22:19 AM | Location : United States







Related Discussions:- Lymphatic system, Assignment Help, Ask Question on Lymphatic system, Get Answer, Expert's Help, Lymphatic system Discussions

Write discussion on Lymphatic system
Your posts are moderated
Related Questions
List of Conditions Requiring Rapid Treatment of Hypertension 1) Cardiac: • Acute aortic dissection • Acute left ventricular failure • Acute or evolving myocardial i

Q. How does the vegetal stratification of an ecosystem influence the biological diversity? The vegetal stratification of the ecosystem like the strata of the Amazon Rainforest,

Determine the types of Cell Based OII the degree of complexity of the cell organisation, two types of cells, namely, prokaryotes and eukaryotes, are recognised. The prokaryotic

What a test tube brush and how is it used? It is a method, made with nylon bristles attached to a twisted-wire shaft, used to knock the bottoms out of test tubes.

Thus, the objectives of the nutritional care process should include the following points: 1. Restoration of good nutritional status with dietary modifications and counseling.

a) Why is it significant that ions being transported across a cell membrane be shielded from the interior of the lipid bilayer? b) Why is photosynthesis referred to as

Cleavage and Blastocyst Even though the cleavage is complete and all the blastomeres are of more or less equivalent size. Synchronization of mitoses in the blastomeres is los

How to Calculate the Biological Value of Protein? A method for determining the biological value of proteins was developed by Mitchell in 1925. It measures the quantity of dieta

Question 1 Give a detailed account on "high energy compounds" Question 2 Describe the various steps involved in Glycolysis Question 3 Give a detailed account on Oxidativ

Explain Viruses and their classification? Viruses are living organisms. Viruses are not living organisms. No, the above is not a misprint! In fact, viruses defy the normal c