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Chapter 8

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Term
Definition
blast/o   germ or bud  
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chyl/o   juice  
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blood   circulating tissue of the body consisting of fluid with formed elements (red blood cells, white blood cells, and platelets) suspended in the blood  
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plasma   liquid portion of the blood and lymph; contains water, proteins, and cellular components (white blood cells, red blood cells, and platelets)  
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serum   liquid portion of the blood that remains after clotting  
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red blood cells / erythrocyte   transport oxygen and carbon dioxide  
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hemoglobin   the protein-iron compound in erythrocytes that transports oxygen and carbon dioxide  
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(PMN) polymorphonuclear leukocyte   another term for neutrophil, referring to the many segments in its nucleus  
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basophil   a granular leukocyte, named for the dark stain of its granules, that brings anticoagulant substances to inflamed tissues; normal range in stained blood smear: 0-1%  
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eosinophil   a granular leukocyte, named for the rose-colored stain of its granules, that increases in allergic and some infectious reactions; normal range in stained blood smear: 1-3%  
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monocyte   an agranulocytic leukocyte that performs phagocytosis to fight infection; normal range in stained blood smear:3-7%  
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lymphocyte   an agranulocytic leukocyte that is active in the process of immunity; the three categories of lymphocytes are T cells (thymus) B cells (bone marrow) and natural killer cells; normal range in stained blood smear:25-33%  
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platelets / thrombocytes   cell fragments in the blood that are essential for blood clotting (coagulation)  
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lymphatic system   consist of lymph vessels, nodes, and tissues through which lymph drains into the blood  
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thymus   primary gland of the lymphatic system, located within the mediastinum, that helps to maintain the body's immune response by producing T lymphocytes  
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spleen   organ between the stomach and the diaphragm that filters out aging blood cells, removes cellular debris by phagocytosis, and provides an environment for lymphocytes to initiate immune response  
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lymph   fluid that is circulated through the lymph vessels  
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lymph capillaries   microscopic vessels that draw lymph from tissues to the lymph vessels  
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lymph vessels / lymphatic vessels   vessels that receive lymph from the lymph capillaries and circulate it in to the lymph nodes  
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lacteals   specialized lymph vessels in the small intestine that absorb fat into the bloodstream  
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chyle   white or pale yellow substance in lymph that contains fatty substances absorbed by the lacteals  
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lymph nodes   many small, oval structures that filter lymph from the lymph vessels; major locations include, cervical, axillary, and inguinal regions  
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lymph ducts   collecting channels that carry lymph from the lymph nodes to the veins  
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thoracic duct   receives lymph from the left side of the head, neck, chest, abdomen, left arm, and lower extremities  
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anisocytosis   presence of red blood cells of unequal size  
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poikilocytosis   presence of large irregularly shaped red blood cells  
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reticulocytosis   an increased number of immature erythrocytes in the blood  
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pancytopenia   an abnormally reduced number of all cellular components in the blood  
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immunosuppression   impaired ability to provide an immune response  
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aplastic anemia   a normocytic-normochromic type of anemia characterized by the failure of bone marrow to produce red blood cells  
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iron deficiency anemia   a microcytic-hypochromic type of anemia characterized by a lack of iron that affects the production of hemoglobin and is characterized by small red blood cells containing low amounts of hemoglobin  
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pernicious anemia   a macrocytic-normochromic type of anemia characterized by an inadequate supply of vitamin B12, causing red blood cells to become large, varied in shape, and reduced in number  
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erythroblastosis fetalis   a disorder that results from the incompatibility of a fetus with Rh-positive blood and a mother with Rh-negative blood, causing red blood cell destruction in the fetus; a blood transfusion is necessary to save the fetus.  
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Rh factor   the antigen on the surface of the red blood cells on the Rh blood group system; its presence can cause a reaction between Rh positive and Rh negative blood  
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hemochromatosis   heredity disorder with an excessive buildup or iron deposits in the body  
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hemophilia   a group of hereditary bleeding disorders caused by a defect in clotting factors necessary for the coagulation of blood  
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leukemia   chronic or acute malignant disease of the blood forming organs, characterized by abnormal leukocytes in the blood and bone marrow  
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myelodysplasia   disorder within the bone marrow characterized by a proliferation of abnormal stem cells; usually develops into a specific type of leukemia  
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lymphoma   any neoplastic disorder of lymph tissue, usually malignant, as in Hodgkin disease  
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polycythemia   increased number of erythrocytes and hemoglobin in the blood  
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CD4 cell count   a measure of the number of cluster of differentiation cells in the blood; used in monitoring the course of HIV and the treatment of AIDS; normal range is 600-1500 cells in a given volume of blood  
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erythrocyte sedimentation rate   a timed test that measures the rate at which red blood cells settle through a volume of plasma  
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prothrombin   protein substance in the blood that is essential to the clotting process  
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prothrombin time (PT)   test to measure activity of prothrombin in the blood  
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thromboplastin   substance present in tissues, platelets, and leukocytes that is necessary for coagulation  
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partial thromboplastin time (PTT)   test to determine coagulation defects, such as platelet disorders  
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