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Lymphatic System

Lymphatic System. B11-5-03 Explain the role of the lymphatic system in protecting the human body. Include: lymph vessels, lymph nodes, and lymph. WARNING! WARNING! WARNING!. White blood cells are the same as … Lymphocytes, in which there are many types…

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Lymphatic System

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  1. Lymphatic System B11-5-03 Explain the role of the lymphatic system in protecting the human body. Include: lymph vessels, lymph nodes, and lymph

  2. WARNING! WARNING! WARNING! White blood cells are the same as … Lymphocytes, in which there are many types… Neutrophils, eosinophil's, basophils, monocytes which are perform… Phagocytosis! Also B Lymphocytes = B Cells

  3. Key component of immune system • Like a secondary circulatory system • How does the circulatory system work?

  4. Functions to • Filter and destroy foreign substances • Filter and destroy cell debris • Produce lymphocytes

  5. Organization

  6. Lymph Vessels • Begins with lymphatic capillaries • Take up excess fluid • Lymph • Muscle contractions of vessels “squeeze” lymph along • Prevented from flowing backward by one-way valves

  7. Lymph • Clear, colourless fluid collected as it filters through the capillaries of the blood

  8. How does it work? • Lymph passes from tiny capillaries to lymph vessels • Flows through lymph nodes located along vessels • Cells of the lymph nodes phagocytize (ingest) • Bacteria • Red blood cells • Cellular waste

  9. How does it work? Cont… • The lymph drains into either • Thoracic duct • Right lymphatic duct • The lymph is then transported back into the veins of shoulder area • Re-enters the general circulatory system

  10. Where does it drain? • Thoracic Duct • Below thorax • Left arm • Left side of head • Left side of neck • Into the left subclavian vein • Right Lymphatic Duct • Right arm • Right side of head • Right side of neck • Into the right subclavian vein

  11. Lymphatic Organs

  12. Tissues of the Lymphatic System • Contain large number of lymphocytes (WBC) • B-Cells • T-Cells

  13. Red Bone Marrow

  14. Red Bone Marrow • Network of connective tissue fibres • Site of stem cells • Divide and produce lymphocytes • B Lymphocytes mature

  15. Thymus

  16. Thymus • Central organ control lymphocyte production and antibody formation • Mature T lymphocytes from red bone marrow • Determines which T cells can detect antigens

  17. Spleen

  18. Spleen • Filters the blood • Harbours lymphocytes that • Remove of and defective blood cells • Phagocytize foreign particles

  19. Lymph Nodes

  20. Lymph Nodes • Small structures along lymphatic vessels, • cleanse lymph • Phagocytosis of foreign particles

  21. Lymph Nodes • During an Infection become enlarged with lymph, white blood cells, and can be felt • Infections of the … can be felt … • Neck or head • In the neck • Breast or arm • In the axillary region • Pelvis or legs • In the inguinal region

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