About Lifelong Learning - Contact Us - DonateFree-Ed.Net Home   Bookmark and Share

 

Major content provider: U.S. National Cancer Institute

anatomy01.jpg (2812 bytes)

Lymphatic System: Unit Review

Here is what we have learned from this unit:

  • The lymphatic system returns excess interstitial fluid to the blood, absorbs fats and fat-soluble vitamins, and provides defense against disease.
  • Lymph is the fluid in the lymphatic vessels. It is picked up from the interstitial fluid and returned to the blood plasma.
  • Lymphatic vessels carry fluid away from the tissues.
  • The right lymphatic duct drains lymph from the upper right quadrant of the body and the thoracic duct drains all the rest.
  • Pressure gradients that move fluid through the lymphatic vessels come from the skeletal muscle action, respiratory movements, and contraction of smooth muscle in vessel walls.
  • Lymph enters a lymph node through afferent vessels, filters through the sinuses, and leaves through efferent vessels.
  • Tonsils are clusters of lymphatic tissue associated with openings into the pharynx and provide protection against pathogens that may enter through the nose and mouth.
  • The spleen is a lymph organ that filters blood and also acts as a reservoir for blood.
  • The thymus is large in the infant and atrophies after puberty.

 

David L. Heiserman, Editor

Copyright   SweetHaven Publishing Services
All Rights Reserved

Revised: June 06, 2015