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Lymphatic System Urinary System Notes

Lymphatic System Urinary System Notes - Lymphatic System...

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Lymphatic System Components- Consists of interstitial fluid called lymph The vessels which convey the lymph are called lymphatics Various concentrations of lymph tissue Lymph nodes, tonsils, thymus, and spleen Lymph circulation Lymphatics form a one way system carrying lymph toward the heart Remember that it is called lymph, plasma and interstitial fluid depending on location The system begins with microscopic, highly porous, dead ended lymph capillaries which leave between cells interstitial fluids move into lymph capillaries through the pores Lymph capillaries merge to form afferent lymphatics , which move lymph toward lymph nodes Lymph exits a lymph node through an efferent lymphatic Efferent lymphatics merge into lymph trunks Efferent exit, afferent towards Lymph vessels are thin walled and have valves The lymph is propelled unidirectional (as in veins) by contractions of surrounding skeletal muscles The lymph trunks merge to form either the thoracic duct or the right lymphatic duct These in turn dump into ether the left or right subclavian vein Main Functions: Drain interstitial fluid from tissue spaces and return it to the bloodstream Transport fats from GI tract to blood Surveillance and defense...the nodes and organs house and produce lymphocytes and monocytes the basis of immunity Lymph Tissues: Lymph nodes- Are found clustered along the vessels Lymph is filtered through sinuses in the nodes The sinuses are lined with phagocytic cells which destroy foreign substances In the lymph nodes are nodules that are home to lymphocytes, the vital immune system cells Tonsils- Are aggregations of lymph nodes around “pits” Tonsils takin in bacteria and expose them to the lymphocytes Spleen- Largest organ in lymph system Functions in removing aged erythrocytes and storing the recovered iron Produces blood cells in a fetus
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Functions like a giant lymph node Thymus: Reaches its largest size around puberty them diminishes until disappearing by about 35. Its functions include the production, programming, and maturation of T-cells a type of lymphocyte Body Defenses: Defenses against invasion are divided into two broad categories: specific and non specific a. non specific defenses- a whole array of membranes, barriers, molecules, and cells which serve as the “front line” first defenses system against pathogens. PATHOGEN: disease causing organism 5 basic non specific defenses- skin and mucous membranes : While unbroken are a physical barrier to invasion additionally hair and mucus tarp invaders. Cilia in the upper respiratory tract serve to move mucus and trapped pathogens in and out Saliva and tears wash away invaders Membranes also create a CHEMICAL barrier, which either kill microorganisms or discourage them from colonizing our membranes Ex. The acidity of sweat, sebum, gastric juice, and the enzyme lysozyme found in tears and saliva.
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