1.4 the Lymphatic System

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Lymphatic system The lymphatic system has several important functions:  Removal of excess interstitial fluid and dissolved substances that leak from the blood capillaries.  Transport of fats from the small interstine to the bloodstream  Defence of the body by exposing bacteria and viruses to white blood cells.  Structure of Lymphatic Vessels  Lymphatic vessels resemble veins in structure with these exceptions:  Lymphatics have thinner walls.  Lymphatics contain more valves.  Lymphatic
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  Lymphatic system  The lymphatic system hasseveral importantfunctions:  Removal of excessinterstitial fluid anddissolved substances thatleak from the bloodcapillaries.  Transport of fats fromthe small interstine to thebloodstream  Defence of the body byexposing bacteria andviruses to white bloodcells.  Structure of Lymphatic Vessels  Lymphatic vessels resemble veins instructure with these exceptions:  Lymphatics have thinner walls.  Lymphatics contain more valves.  Lymphatics contain lymph nodeslocated at certain intervals alongtheir course.  The structure of lymphatic system 1. L.S starts from the minute blind-ended tubes including lacteal in the ileum, & lymphatic capillaries (L.C) in othertissues 2. The L.C join to form larger lymphatic vessel called Lymphatics 3. Semilunar valves are present along the lymphatics 4. The lymphatics from all part of the body finally form 2large ducts, the right lymphatic ductandthoracic duct . 5. Situated at intervals along the lymphatics are the oval-shaped structures called lymph nodes 6. Lymphocytes are found in the lymph nodes. It produce antibodies   and play an important roles in the body’s immune system. 7. Phagocytes in the lymph nodes help to remove bacteria
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