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50. The percent fraction of formed elements relative to whole blood is the a. viscosity b. hemoglobin concentration c. complete blood count d. hematocrit. e. differential cell count. 51. The heme group of an alpha chain polypeptide in hemoglobin can carry an oxygen molecule when oxygen binds to a. sodium b. iron c. carbon d. chloride e iodine 52. One hemoglobin molecule is capable of carrying a maximum of how many oxygen molecules? a. one b. two c. four d. eight e. twelve 53. Which of the following is most likely to stimulate erythropoiesis? a. low blood calcium level b. low blood glucose level c. high blood calcium level d. hypoxia within the kidneys e. absence of B12 in diet 54. Most of the iron that is removed during hemoglobin breakdown is a. excreted by the kidneys b. transported to the brain c. excreted by the liver d. eliminated in the feces e. bound by transferrin 55. The plasma proteins responsible for causing blood colloid osmotic pressure (BCOP) are: a. albumins b. fibrinogen c. immunoglobulins d. G proteins e. spectrins 56. More than 95% of the protein found in an erythrocyte is: a. albumin b. fibrinogen c. fibrin d. spectrin e. hemoglobin