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14. In adults, the blood cells are generated primarily in ____.
C. red bone marrow
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15. Erythrocytes normally circulate in blood stream for an average of ___.
A. 4 months
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16. Which organ is especially involved in breaking up old erythrocytes?
A. spleen
B. bone marrow
C. lung
D. heart
E. kidney
A. Spleen
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17. The primary function of leukocytes is to ___.
D. kill pathogens such as bacteria
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18. Which of the following is a normal hematocrit value?
A. 45%
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19. The most abundant leukocytes in normal circulating blood are ____.
C. neutrophils
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20. Which of the hormones stimulates production of red blood cells?
B. erythropoietin
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21. A patient, who lost two kidneys and survive on dialysis, most likely has a ___.
D. low erythrocyte count
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22. Under which condition more erythrocytes are produced?
D. hypoxemia
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23. In response to inflammation, leukocyte count can increase to 3-4 folds of its normal value of ___.
A. 4,000-10,000/ml
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24. Leukocytes usually stay only in the blood stream.
A. The above statement is true.
B. The above statement is false.
B. the Above is false
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25. Which of the following steps is not involved in the attack of bacteria which invade in a tissue outside blood vessels?
D. agglutination
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26. The majority of leukocytes can live ____.
D. for several hours to several days
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