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lympathic system is a widespread system that consist of tissue and vessels, it organs are scattered through the the body and services almost all regions functions of the lympathic system fluid balance, protection from infection, absorption of fat lymphatic circulation its a one way system that begins in the tissue and ends when the lymph joins the blood lymphatic capillaries made up of one layer of epithelial cells, more permible than blood capillaries, closed at one end and dont form bridges between larger vessels, lies in a lake of tissue fluid and communicate with vessels that transport lymph toward the heart, located in the lining of small intestines and absorb fat lymphatic vessels thin walled, have beaded apperance because of indentations where valves are located, named according to location, include superficial and deep sets, drain through lymph nodes valves prevent back flow lymph nodes small rounded masses varing from pinhead size to 1 inch, filter the lymph, massed in numbers varying from 2 or 3 to well over 100 nodes are groups that serve a pitcular region spleen organ that consist of lymphoid tissue designed to filter blood fuctions of the spleed clean blood of impurties and cellular debris bf filteration or phagocytosis, destroy old RBC's, produce RBC's before birth, serve as a resevoir for blood which can be retured to the blood stream thymus located in the superior thorax beneath the sternum, function of the thymus has a wider function than other lymphoid system, play a key role in immune development before birth and during the first few months of life, aids in T-cell development,most active during early life, after puberty, tissue changes, shrinks and replaced by connective tissue and fat tonsils mass of lymphatic tissuenlocated in the vicinity of the pharynx, throat, remove contaminats from materials that are inhaled or swallowed functions of tonsils have deep grooves lined with lymphatic nodgles, lymphocytes attack pathogens trapped in grooves, tonsils may become loaded with bacteria and need to be removed appendix is a finger like tube of lymphatic tissue immunity is the final line of defense against disease immunity to disease is defined as an individual's power to resist or overcome the effects of a particular agent or its harmful products specific defenses of immunity innate-inborn immunity, adaptive/ acquired immunity innate-inborn immunity inherited along with other charaacteristics in a person's genes adapative/ acquired immunity develops after birth, maybe obtained by natural or artificial means, maybe active or passive, natural acquired immunity immunity maybe acquired naturally through contact with a specific disease organism, antibodies from by the infected cell act against the agent or toxins artificial acquied immunity a person who has not been exposed to particular organism. receive vaccinations/immunization blood stream lymphatic essels carry lymph away from the regional nodes and eventually empty into the cervical nodes located in the neck axillary nodes located in axillae- armpits tracheobronchial nodes foound near the trachea and around the larger bronchial tubes mesenteric nodes found between two layersnof perritoneum that form the mesentery inguinal nodes lacated in the groin region nonspecific defenses chemical and mechanical barriers, phagocytosis, natural killers cells, inflammation, fever chemical and mechanical barriers first line of defense against invaders -skin sneezing and coughing phagocytes white blood cell take in a destroy waste and foreign material natural killer cells type of lymphocytes that can recognize body cells with virus and can destroy them on contact inflammation the body effort to grt ride of anything that irritates it, heat redness edema, pain fever phagocytes, release substances that raise body temperature