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SI Lymphatic

Southeastern Institute A&P 13. Lymphatic System

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