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Blood Ch

Chapter 13 definitions

Plasma Clear, extracellular matrix of blood; roles in clotting, the immune system, & regulation of fluid volume; 55% of bood
Formed elements Cell and cell fragments that make up 45% of blood; consists of erythrocytes, leukocytes, & platelets
Hematocrit Percentage of cells in a sample of blood; how much oxygen the blood can carry
Viscosity Determined by the combination of plasma and blood cells; refers to how thick or sticky a fluid is
Hemopoiesis Production of blood
Hemoglobin Red pigment that gives blood its color; fills over 1/3 of the interior of an RBC
Globins Ribbon-like protein chains in hemoglobin
Heme Iron-containing molecule bound to each globin; each can combine with 1 molecule of oxygen
Erythropoiesis Producing new erythrocytes; process takes 3-5 days
Erythropoietin EPO; hormone secreted by the kidneys that stimulates red bone marrow to begin creating new erythrocytes
Reticulocyte Immature form of an erythrocyte; takes 1-2 days to mature
Hemolysis Excessive destruction of RBCs
Polycythemia Excess of RBCs
Anemia Deficiency of RBCs or hemoglobin
Hemolytic anemia Results when too many RBCs are being destroyed
Pernicious anemia Results from a lack of vitamin B12
Leukocytes WBCs; fewest of the formed elements; 5 types in the body; all contain a neucleus; spend most of their lives in connective tissue
Granulocytes WBCs containing a single multilobular nucleus; 3 types include neutrophils, eosinophils, and basophils
Agranulocytes WBCs lacking cytoplasmic granules and the neuclei lack lobes; 2 types include lymphocytes and monocytes
Leukopenia Abnormally low WBC count
Leukocytosis Elevated WBC count
Platelets Thrombocytes; 2nd most abundant formed element; key role in hemostasis; live about 7 days
Hemostasis Stopping bleeding
Reaction cascade Series of reactions in which each depends on the product of the preceding reaction
Heparin Anticoagulant secreted by basophils and mast cells
Thrombus Unwanted blood clot inside a vessel
Embolus Piece of clot breaks off and circulates through the blood stream
Antigen Agglutinogen; protein carried on the surface of each red blood cell; 2 types are A & B
Antibodies Agglutinins; carried by plasma; against the antigens of other blood types
Agglutination Large clumps of antigen-antibody molecules
Created by: cbooher16



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