PLN 203 Lecture Notes - Lecture 8: Lymphatic Vessel, Lingual Tonsils, Memory T Cell
23 Mar 2017
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Document Summary
Pln203 intro to the lymphatic system and immunity. Pathogens: microscopic organisms that cause disease, viruses, bacteria, fungi, parasites. Lymphatic system not green more of a off white/grey: protects against disease. Lymphatic system cells respond to: environmental pathogens, toxins, abnormal body cells (ie cancer) Lymphocytes identify, attack and develop immunity (specific pathogen) Non-specific diseases: block or attack any potential infectious organism, cannot distinguish one attack form another. Immunity ability to resist infection and disease: all body cells and tissues involved in production of immunity (not just lymphatic system) Function of lymphatic system to produce, maintain, and distribute lymphocytes. Lymphocytes produced in tissues, organs and red bone marrow. Lymphocyte distribution detects problem and travels to site of injury. From blood to interstitial fluid through capillaries: returns to venous blood through lymphatic vessels. From blood plasma lymph venous system. Lymphatic system begins with smallest vessels (lymphatic capillaries) Lymphatic capillaries larger lymphatic vessels containing one-way valves.
