lymphatic system. functions of the lymphatic system fluid balance - returns interstitial fluid to...
Post on 21-Dec-2015
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Lymphatic System
Functions of the Lymphatic System
• Fluid Balance - returns interstitial fluid to the blood
• Fat [and fat soluble vitamins] Absorption - from the digestive tract via lacteals into the venous circulation
• Immunity - using lymphocytes & phagocytes microorganisms are filtered and removed from circulation
Components• Lymph - fluid similar to plasma
• Lymphatic Vessels - begin with blind-ended sacs at capillaries, and merge to form lymphatic vessels - similar to veins in structure. Vessels merge and drain into ‘trunks’ which dump lymph into ducts– right lymphatic duct– thoracic duct
Lymphatic Organs
• Lymph Nodes - round, oval or bean shaped, less than 2.5 cm in length. Distributed throughout body, except for CNS & bone marrow.
Lymphatic Organs
• Tonsils - 3 groups: pharyngeal [adenoids], palatine, lingual
• Spleen - filters blood, not lymph
• Thymus
• Appendix
Human T-Lymphocyte
Immunity [Latin: immunis = exempt]
2 main functions: recognition & response
can be innate - born with - will not be specific
or acquired / adaptive - will be specific, due to memory [long or short term memory]
Innate - 4 types of defensive barriers: anatomic, physiologic, phagocytic, inflammatory