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Lymphatic & immune

Lymphatic & immune - 25 Lymphatic Immune System 1...

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25: Lymphatic & Immune System 1. General function a. Transport interstitial fluid back to blood i. One-way system: flows toward heart ii. Fluid from capillaries and venules form lymph: formed by blood proteins leaking out of capillaries b. Role of immune system: protect from foreign organisms 2. Lymphatic cells (lymphocytes) a. Are cells of the immune system b. Provide defense against infectious organisms i. Antigen specific responses c. Travel in blood, lymph, or connective tissue 3. Lymphocytes a. T-lymphocytes: i. Origin: bone marrow ii. Site of maturation: thymus gland iii. Function in immune response: target foreign antigens on antigen-bearing cells of body. Attach and cause destruction of cell and antigen b. B-lymphocytes: i. Origin: bone marrow ii. Site of maturation: bone marrow iii. Function in immune response: differentiate into plasma cells that secrete antibodies. Antibodies flag cells for destruction by macrophages. Usually respond to bacteria.
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