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

Microbes, what microbe is the one that is shaped like a ball with spikes co...

what microbe is the one that is shaped like a ball with spikes comming out

Nerves - organisation of nervous system, Nerves - Organisation of Nervous S...

Nerves - Organisation of Nervous System Due to the pattern of distribution of neurons as described above, there are bundles of nerve fibers, called nerves, connecting the cent

Male reproductive system of frog, Male reproductive system of frog: i) ...

Male reproductive system of frog: i) Testis : a) There are a pair of testis which are attached to the kidneys. b) They are oval and yellow in colour. c) Inside the testis th

Differentiate between sterilization and disinfection, Q. Differentiate betw...

Q. Differentiate between sterilization and disinfection? Sterilization is defined as freeing the object or substance from all life of any kind. It is the process by which an ar

Polyphyletic theory, Please I need short notes on polyphylrtic theory

Please I need short notes on polyphylrtic theory

Clinical features of gout disease, Q. Clinical Features of gout disease? ...

Q. Clinical Features of gout disease? You may be enjoying good heath but may suddenly get a severe attack. You wake up in the middle of the night, and your big toe feels as if

Why should posterior wall preffered during surgery, Why should Posterior wa...

Why should Posterior wall preffered during surgery Posterior wall should not be perforated during surgery. This limits bleeding from the pterygoid plexus or branches of the max

Why is an s strain of bacteria able to cause disease, Why is an S strain of...

Why is an S strain of bacteria able to cause disease in mammals but a R strain is not? The slippery capsule stops the cells of the defence system from capturing and destroying

Explain secretion of parathormone and calcium blood level, What is the rela...

What is the relation between secretion of parathormone and the calcium blood level? The parathormone enhances the calcium blood level as it stimulates the resorption (remodelat

Classification of hypertension, Q. Show basic Classification of hypertensio...

Q. Show basic Classification of hypertension? Unlike many other diseases, hypertension develops insidiously (without symptoms). In 90% of hypertension cases, the cause is unkn

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