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| 31. | erythropoietin | (EPO) glycoprotein that triggers the bone marrow to produce RBCs; secreted by the kidney in response to low oxygen levels |
| 32. | extrinsic pathway | initial coagulation pathway that begins with tissue damage and results in the activation of the common pathway |
| 33. | ferritin | protein-containing storage form of iron found in the bone marrow, liver, and spleen |
| 34. | fibrin | insoluble, filamentous protein that forms the structure of a blood clot |
| 35. | fibrinogen | plasma protein produced in the liver and involved in blood clotting |
| 36. | fibrinolysis | gradual degradation of a blood clot |
| 37. | formed elements | cellular components of blood; that is, erythrocytes, leukocytes, and platelets |
| 38. | globin | heme-containing globular protein that is a constituent of hemoglobin |
| 39. | globulins | heterogeneous group of plasma proteins that includes transport proteins, clotting factors, immune proteins, and others |
| 40. | granular leukocytes | leukocytes with abundant granules in their cytoplasm; specifically, neutrophils, eosinophils, and basophils |
| 41. | hematocrit | (also, packed cell volume) volume percentage of erythrocytes in a sample of centrifuged blood |
| 42. | heme | red, iron-containing pigment to which oxygen binds in hemoglobin |
| 43. | hemocytoblast | hemopoietic stem cell that gives rise to the formed elements of blood |
| 44. | hemoglobin | oxygen-carrying compound in erythrocytes |
| 45. | hemolysis | destruction (lysis) of erythrocytes and the release of their hemoglobin into circulation |
| 46. | hemolytic disease of the newborn | (HDN) (also, erythroblastosis fetalis) disorder causing agglutination and hemolysis in an Rh+ fetus or newborn of an Rh- mother |
| 47. | hemophilia | genetic disorder characterized by inadequate synthesis of clotting factors |
| 48. | hemopoiesis | production of the formed elements of blood |
| 49. | hemopoietic growth factors | chemical signals including erythropoietin, thrombopoietin, colony-stimulating factors, and interleukins that regulate the differentiation and proliferation of particular blood progenitor cells |
| 50. | hemopoietic stem cell | type of pluripotent stem cell that gives rise to the formed elements of blood (hemocytoblast) |
| 51. | hemorrhage | excessive bleeding |
| 52. | hemosiderin | protein-containing storage form of iron found in the bone marrow, liver, and spleen |
| 53. | hemostasis | physiological process by which bleeding ceases |
| 54. | heparin | short-acting anticoagulant stored in mast cells and released when tissues are injured, opposes prothrombin |
| 55. | hypoxemia | below-normal level of oxygen saturation of blood (typically <95 percent) |
| 56. | immunoglobulins | (also, antibodies or gamma globulins) antigen-specific proteins produced by specialized B lymphocytes that protect the body by binding to foreign objects such as bacteria and viruses |
| 57. | interleukins | signaling molecules that may function in hemopoiesis, inflammation, and specific immune responses |
| 58. | intrinsic pathway | initial coagulation pathway that begins with vascular damage or contact with foreign substances, and results in the activation of the common pathway |
| 59. | leukocyte | (also, white blood cell) colorless, nucleated blood cell, the chief function of which is to protect the body from disease |
| 60. | leukocytosis | excessive leukocyte proliferation |
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