45 6-9. All of the following are components of the microscope’s illumination system EXCEPT 1. internal light source 2. condenser 3. external light source 4. iris diaphragm 6-10. The total magnification available by using the lens color coded red is 1. 1000X 2. 450X 3. 100X 4. 10X 6-11. Light travels from the objective to the ocular lens through what component of the microscope? 1. Body tube 2. Iris diaphragm 3. High-powered lens 4. Revolving nosepiece 6-12. What objective should be used for a detailed study of stained bacterial smears? 1. Low power 2. High dry 3. Oil immersion 4. Either 2 or 3 above 6-13. If necessary, which, if any, of the following substances may be used for cleaning the lenses on a microscope? 1. Alcohol 2. Bleach 3. Xylene 4. None of the above 6-14. A CBC includes which of the following? 1. Total RBC count 2. Hematocrit 3. Differential WBC count 4. All of the above 6-15. The hemacytometer is designed primarily for what purpose? 1. To differentiate between red blood cells and white blood cells 2. To count white blood cells 3. To count red blood cells 4. Both 2 and 3 6-16. The main reason for using the cover glass included with the hemacytometer instead of an ordinary cover glass is because the hemacytometer cover glass 1. is clearer 2. has an even surface 3. is thicker 4. is less likely to break 6-17. A subnormal RBC count may indicate that the patient has which of the following listed conditions? 1. Leukopenia 2. Anemia 3. Dehydration 4. Uremia 6-18. What is the total capacity of the capillary pipette provided in a Unopette® for RBC count? 1. 0.5µl 2. 1.0µl 3. 10.0µl 4. 100.0µl 6-19. Which of the following conditions indicates that the counting chamber is properly loaded? 1. There is a thin, even film of fluid under the coverglass 2. The fluid flows into the grooves at the edges of the chamber 3. Air bubbles are seen in the field 4. The chamber is flooded