Ch23_Lymphatic

Ch23_Lymphatic - Lymphatic system Lymphatic system...

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Lymphatic system Lymphatic system
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Functions of the lymphatic system Protection against pathogens (leukocytes) Return of ‘fluid’ from the interstitial space to the rt. atrium of the heart Aids in absorption/transport of dietary lipids, lipid-soluble vitamins (A,D,K and E)
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Components of the lymphatic system • Spleen • Thymus • 5 Tonsils • Lymph nodes (distributed all over the body) • Lymphatic vessels • Peyer’s patches • lacteals
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Fig 23.1
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Lymphocytes • A type of leukocyte • Function in specific immunity • Destroy pathogens • Travel thru the cardiovascular & lymphatic systems
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Types of lymphocytes • Three types: – T cells (thymus-dependent) – B (bone marrow derived) cells – NK cells (natural killer)
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T cells • 80% of the circulating lymphocytes • Directly attack pathogens- Cytotoxic T cells • Control activity of B cells- Helper T cells Suppressor T cells • Memory T cells-after the primary infection they are on reserve until the same antigen appears in the body • Affected by Human Immunodeficiency Virus
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This note was uploaded on 11/10/2011 for the course PDBIO 220 taught by Professor Tomco during the Winter '09 term at BYU.

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Ch23_Lymphatic - Lymphatic system Lymphatic system...

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