Bios 1083Immune system

Bios 1083Immune system - Bios 1083-Lymph Transport and...

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Bios 1083--Lymph Transport and Immunity I. Lymphatic System-Three Functions 1. Lymphatic capillaries take up excess fluid from the tissues and returns it to the bloodstream at the subclavian veins. 2. Absorbs fats from the small intestine and transports it to the blood. 3. Helps defend the body from disease. B. Lymphatic vessels-One-Way transport. Lymphatic vessels include lymphatic capillaries, lymphatic vessels and then into 2 ducts, the thoracic duct and right lymphatic duct which return the lymph to blood in the subclavian veins at the shoulders. C. Lymphoid organs- lymph nodes (filter lymph for pathogens), spleen (filters blood for pathogens), tonsils, thymus gland (T-lymphocytes mature here) and red bone marrow D. Red Bone Marrow-Stem Cells that produce all the formed elements of blood including-Erythrocytes (RBCs), WBCs, Monocytes, Lymphocytes (B and T cells of the immune system) II. -Pathogens (Bacteria, Viruses, Fungi, Protozoa, Parasitic Worms) A. Bacteria themselves are toxic to the body they have endotoxin in their cell walls, or they can take up residence outside your cells. Those that take up residence outside your cells usually release exotoxins that cause the disease such as tetanus is caused by tetanus toxin. B. Viruses are not living and must take up residence inside cells to survive. Viruses can reproduce in your cells through 2 pathways. 1. Lytic cycle-Viruses carry DNA that can be put inside your DNA. They take control of your cell and make so many copies of themselves (in the thousands), they cause the cell to rupture (lysis) and die. 2. Lysogenic cycle-viruses can integrate their DNA into your DNA and instead of making so many copies that they kill the cell. The virus will make just a few copies at a time, which will bud off from the cell. Herpes simplex virus does this, which is why you get repeated cold sores.
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III. Innate Immune Defenses 4 Types
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Bios 1083Immune system - Bios 1083-Lymph Transport and...

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