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
Define Factorial method to Calculate Nitrogen Requirements? The nitrogen requirements have been calculated by a factorial method suggested by different expert groups, described

What is Gingival Inflammation Areas of overt inflammation should be identified and the etiology investigated to initiate proper treatment.

Define Factors that affect the requirement of Protein? Protein requirement is greatly influenced by many factors such as age, environmental temperature, energy intake, gender,

How Delayed Complementary Feeding Cause PEM? The mothers from poorer socioeconomic groups where PEM is more prevalent, delayed introduction of complementary foods (foods in add

Geotropism - Root and Shoot Morphogenesis Roots always grow towards gravity. The lot threshold of geotropic response requires as little time as one minute Gravity pulls auxin

Soybean protein isolates:  Soy protein isolates are the most pure and refined soy protein available.  Isolated soybean proteins (ISP), or  soybean protein isolates, are the mos

Xerarch - Kinds of Succession When the succession takes place in drier area, i.e., the succession progresses from xeric to mesic conditions. It is further subdivided as:

Which of the following is a true statement regarding the Eyes Absent Protein? A. EYA is a transcriptional activator that having both a DNA binding domain and a transactivation

Q. What is the fundamental structure of a virus? Viruses are constituted of genetic material RNA or DNA covered by a protein capsule also known as a capsid. Some viruses, like

Explain the Altered Glucose Metabolism - Metabolic Response to Injury? Following injury, hypoglycemia commonly occurs and is related to the severity of the stress. In the ebb p