Lymphatic system, Biology

Assignment Help:

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


Related Discussions:- Lymphatic system

Radiobiology, Radiobiology : This is the study of effects of radiations on ...

Radiobiology : This is the study of effects of radiations on living organisms. Radiobiology is a branch of science which concerned with the action of ions. Radiobiology is the radi

Questions, assignment having 12 questions

assignment having 12 questions

Is diabetes causes the cardiovascular disease, Q. Is Diabetes causes the ca...

Q. Is Diabetes causes the cardiovascular disease? Diabetes: Sustained hyperglycemia is associated with tissue damage and cardio- myopathies. You shall study about diabetes and

Spoilage of soft drinks, Q. Explain Spoilage of Soft Drinks? We all co...

Q. Explain Spoilage of Soft Drinks? We all consume soft drinks, fruit juices, as well as, preserves, which normally are available in the market as tetrapacks, cans, bottles

Calculate the molar concentration of illinic acid, Calculate the molar conc...

Calculate the molar concentration of illinic acid and of its conjugate base illinate ion (in moles/L; M) in a 0.002 M illinate buffer at pH 12.0. The pKa of illinic acid is 6.7. En

How does the intensity of simple diffusion differ, Q. How does the intensit...

Q. How does the intensity of simple diffusion differ in relation to the concentration gradient of the moved substance? The higher the concentration gradient of a substance the

Molecular bio, he recombinant plasmid extracted from the surviving colonies...

he recombinant plasmid extracted from the surviving colonies contains a gene called SUC2 that codes for convertase, an enzyme needed to metabolize sucrose. Mutations in the SNF gen

Discovery of the cell, Q. Describe the Discovery of the Cell? Ans: The ...

Q. Describe the Discovery of the Cell? Ans: The discovery that living organisms are composed of cells was made by an Englishman, Robert Hooke, in 1665. Hooke used the light mic

Animal reproduction, Animal Reproduction - Reproduction is the ability ...

Animal Reproduction - Reproduction is the ability to produce new organism of its own type. It is meant to increase their number. Reproduction includes - (i) Replication o

Explain about the chytridiomycota - fungi, Explain about the Chytridiomycot...

Explain about the Chytridiomycota - Fungi Chytridiomycota - Look at the Figure, which illustrates chytridiomycota. These are the simplest among true fungi and are commonly call

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd