lymphatic system and immunity

lymphatic system and immunity PowerPoint PPT Presentation

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Functions of Lymphatic System. Draining interstitial fluidTransporting dietary lipidsProtection. Lymphatic Vessels. Begin as closed ended lymph capillaries in tissue spaces between cellsNOT A CIRCULATING FLUIDInterstitial fluid drains into lymphatic capillaries, forming lymph.Lymph capillaries merge to form lymphatic vessels.

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lymphatic system and immunity

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1. Lymphatic System and Immunity Chapter 16

3. Lymphatic Vessels Begin as closed ended lymph capillaries in tissue spaces between cells NOT A CIRCULATING FLUID Interstitial fluid drains into lymphatic capillaries, forming lymph. Lymph capillaries merge to form lymphatic vessels

7. Lymphatic capillaries Made of a single layer of squamous epithelial cells Slightly larger than blood capillaries Cells overlap and act as one-way valves Opened by pressure of interstitial fluid Anchoring filaments attach cells to surrounding tissue

10. Lymphatic vessels Resemble veins (same 3 layers) Found throughout body except: Avascular tissues Central nervous system Splenic pulp Bone marrow

15. Lymphatic Organs Red bone marrow Primary organs Thymus gland Lymph nodes Lymph nodules Secondary organs Spleen

17. Lymph Nodes Lymph is filtered through lymph nodes Found in clusters “Waste water treatment plants” Vary in size Principal groupings in cervical, axillary and inguinal regions. Provide biological filtration Site of cancer growth and metastasis

19. Vessels enter node on convex side Lymph passes through irregular channels called sinuses Leaves node through one or two efferent vessels at the hilum or hilus Capsule, cortex and medulla Cortex contains lymph nodules Follicular dendritic cells Germinal centers – B cells proliferate

25. Thymus gland in mediastinum above the heart largest at age 10-12 then begins to atrophy Pre - T cells come from bone marrow and develop into T cells T cells then go to other lymphatic tissues Thymus produces hormone thymosin - aids maturation of T cells elsewhere in body

27. Spleen Largest lymphoid organ In upper left quadrant of abdomen Has a hilum and a capsule Sinuses contain blood instead of lymph

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