Biomed 100 Practice Quiz
Chapter 12, Fall 2007

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1. Which of the following are considered "formed elements" of blood?
   1. erythrocytes (red blood cells)
   2. leukocytes (white blood cells)
   3. thrombocytes (platelets)
   4. both A. and B.
   5. all of the above
   
   
2. Of the items on the following list, _?_ are the smallest and are actually just fragments of a precursor cell.
   1. erythrocytes
   2. leukocytes
   3. thrombocytes
   
   
3. It is not characteristic of erythrocytes (red blood cells) to have
   1. a disc shape with concavities on both sides
   2. an irregular nucleus with lobes
   3. approximately 280 million molecules of hemoglobin
   
   
4. Which one of the following contains the most iron?
   1. platelets
   2. fibrinogen
   3. hemoglobin
   4. granules of basophils and eosinophils
   
   
5. Which one of the following is most likely to stimulate erythrocyte production?
   1. vaccination
   2. primary immune response
   3. secondary immune response
   4. low blood oxygen concentration
   5. presence of diseased or damaged blood vessels
   
   
6. The _?_ contain(s) stem cells that give rise to red blood cells.
   1. liver and spleen
   2. red bone marrow
   3. lymphatic organs
   4. all of the above
   5. none of the above
   
   
7. A platelet plug begins to form when platelets are exposed to
   1. air
   2. a rough surface such as collagen
   3. a smooth surface such as endothelium
   4. both A. and C.
   5. both B. and C.
   
   
8. Which one of the following is normally the least?
   1. oxygen pressure in atmosphere
   2. oxygen pressure in lungs
   3. oxygen pressure in oxygenated blood
   4. oxygen pressure in organs such as brain, liver, and kidneys
   5. none of the above (they all have the same oxygen pressure)
   
   
9. Functions of leukocytes (white blood cells) include
   1. gas exchange
   2. blocking blood loss from damaged vessels
   3. specific immunity and nonspecific defenses
   4. both B. and C.
   5. all of the above
   
   
10. In which of the following do platelets release factors that cause a plasma protein to form "sticky threads?"
    1. agglutination
    2. platelet plug formation
    3. coagulation (blood clotting)
    4. both A. and B.
    5. all of the above