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126 Unit II Overview of the Human Body 20. A blood clot circulating in the bloodstream is called a(n) a. embolism. embolus. 21. The structure in the heart that starts the heartbeat is the a. AV node. b. AV bundle. c. phlebitis. d. thrombus. c. bundle branches. d) sinoatrial node. 22. The normal ECG tracing is useful for diagnosing a. blood pressure abnormalities. b. circulatory embolism.. damage to the heart muscle. pacemaker malfunction. 23. An erythrocyte's main function is to carry oxygen from the lungs to the cells. b. engulf and destroy foreign matter. c. form cellular plugs to stop bleeding. d. release histamine and heparin. c. prothrombin time. d. reticulocyte count. 24. A laboratory test that is ordered to evaluate the hemostatic process is a. bone marrow biopsy. b. complete blood count. 25. The major difference between serum and plasma is a. plasma contains fibrinogen. b. plasma is obtained from clotted blood. c. serum contains clotting factors. d. serum is obtained from whole blood. 26. Individuals with which blood type were once called universal donors? a. A b. AB c. B d. O 27. A main function of WBCs is to a. carry O₂ and CO₂. b. destroy pathogens. c. help blood clot. d. synthesize proteins. 28. Which is a heart disorder test? a. B-type natriuretic peptide (BNP) b. Fibrin degradation products (FDP) c. Total iron-binding capacity (TIBC) d. All of the above 29. Which is an abbreviation for an immature RBC c. Retic d. Seg a. Baso b. Mono 30. Factor VIII deficiency causes a. hemophilia A. b. Hodgkin disease. c. sickle cell anemia. d. thrombophlebitis.