Southeastern Institute A&P 13. Lymphatic System
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| Lymphatic System Functions | Drains interstitial fluid, Transports lipids & fat soluble vitamins from digestive tract into blood, Immunity against disease
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| Lymph | Extracellular fluid found between tissues, fluid of lymphatic system
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| Lymphatic System Movement | One direction – toward subclavian veins, Moves only through pressure
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| Lymphatic capillaries | Same structure as blood capillaries, Larger & more permeable
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| Lymphatic vessels | The pipes of the lymphatic system
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| Lymphatic trunks | Where vessels merge before joining the ducts
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| Right lymphatic duct | Drains lymph from right arm and right side of head and right thorax to Right Subclavian Vein
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| Thoracic duct | Drains lymph from the rest of the body into the Left Subclavian Vein
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| Cisterna Chyli | Lymphatic sac at the beginning of the thoracic duct between the abdominal aorta and L2
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| Bone Marrow | Site of hemopoeisis
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| Pluripotent Stem Cells | Precursor blood cells
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| Lymphocytes | WBC’s
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| B cells | Mature in Bone Marrow
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| T cells | Mature in thymus
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| Thymus | Reaches maximum size by puberty & then atrophies, Maturation of T cells
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| Spleen | Largest lymphatic organ, Stores blood cells, Destroys old, worn out RBC’s, Antibody production
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| Lymph Nodes | Found along lymphatic vessels, Only place where lymph is filtered, Cervical, axillary & inguinal nodes are routinely checked by physicians
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| Mucosal-associated lymphoid tissue (MALT) | Collection of nodules in mucosa or submucosa of digestive tract
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| Tonsils | MALT around throat
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| Peyer’s Patches | MALT, Intestinal tonsils
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| Vermiform appendix | Inferior to the cecum
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| Immunity | Defense reaction to microorganisms
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| Natural Immunity | Nonspecific response to invading pathogens, like fever & inflammation
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| Fever | Elevated body temperature to kill pathogens
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| Inflammation | Protective mechanism that stabilizes & prepares damaged tissue, local heat, swelling, redness, pain, & decreased function
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| Acquired Immunity | Diverse but specific response to pathogens, Uses lymphocytes
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