CHAPTER 10 Flashcards
- The megakaryocyte progenitor that undergoes endomitosis is:
a. MK-I
b. BFU-Meg
c. CFU-Meg
d. LD-CFU-Meg
d. LD-CFU-Meg
- The growth factor that is produced in the kidney and induces growth and differentiation of committed
megakaryocyte progenitors is:
a. IL-3
b. IL-6
c. IL-11
d. Thrombopoietin
d. Thrombopoietin
- What platelet organelle sequesters ionic calcium and binds a series of enzymes of the eicosanoid pathway?
a. Glycocalyx
b. Dense granules
c. Dense tubular system
d. Surface connected canalicular system
c. Dense tubular system
- What platelet membrane receptor binds fibrinogen and supports platelet aggregation?
a. GP Ib/IX/V
b. GP IIb/IIIa
c. GP Ia/IIa
d. P2Y1
b. GP IIb/IIIa
- What platelet membrane phospholipid flips from the inner surface to the plasma surface on activation and serves as the assembly point for coagulation
factors?
a. Phosphatidylethanolamine
b. Phosphatidylinositol
c. Phosphatidylcholine
d. Phosphatidylserine
d. Phosphatidylserine
- What is the name of the eicosanoid metabolite produced from endothelial cells that suppresses platelet activity?
a. Thromboxane A2
b. Arachidonic acid
c. Cyclooxygenase
d. Prostacyclin
d. Prostacyclin
- Which of the following molecules is stored in platelet dense granules?
a. Serotonin
b. Fibrinogen
c. Platelet factor 4
d. Platelet-derived growth factor
a. Serotonin
- What plasma protein is essential for platelet adhesion?
a. VWF
b. Factor VIII
c. Fibrinogen
d. P-selectin
a. VWF
- Reticulated platelets can be enumerated in peripheral blood to detect:
a. Impaired platelet production in disease
states
b. Abnormal organelles associated with
diseases such as leukemia
c. Increased platelet production in
response to need
d. Inadequate rates of membrane
cholesterol exchange with the plasma
c. Increased platelet production in
response to need
- White clots:
a. Occur primarily in the deep veins of the
leg
b. Are characteristic of the secondary
hemostatic process
c. Are largely composed of platelets and
von Willebrand factor
d. Form normally in response to vascular
injury and are completely harmless
c. Are largely composed of platelets and
von Willebrand factor
- Upon activation, platelets secrete their a-granule contents via:
a. The dense tubule system
b. The surface connected canalicular
system
c. The glycocalyx
d. Microtubules
b. The surface connected canalicular
system
- Microparticles:
a. Are stored in platelet dense granules
b. Inhibit blood clotting
c. Bud off of platelets after their exposure
to strong agonists
d. Exhibit no biologic activity
c. Bud off of platelets after their exposure
to strong agonists
- A 1:20 dilution of blood is made with 3% glacial acetic acid as the diluent. The four large corner squares on both sides of the hemacytometer are counted, for a total of 100 cells. What is the total WBC count (3109 /L)?
a. 0.25
b. 2.5
c. 5
d. 10
b. 2.5
- The total WBC count is 20 3 109 /L. Twenty-five NRBCs per 100 WBCs are observed on the peripheral blood film. What is the corrected WBC count (3109 /L)?
a. 0.8
b. 8
c. 16
d. 19
c. 16
- If potassium cyanide and potassium ferricyanide are used in the manual method for hemoglobin determination, the final product is:
a. Methemoglobin
b. Azide methemoglobin
c. Cyanmethemoglobin
d. Myoglobin
c. Cyanmethemoglobin
- Which of the following would NOT interfere with the result when hemoglobin determination is performed by the cyanmethemoglobin method?
a. Increased lipids
b. Elevated WBC count
c. Lyse-resistant RBCs
d. Fetal hemoglobin
d. Fetal hemoglobin
- A patient has a hemoglobin level of 8.0 g/dL. According to the rule of three, what is the expected range for the hematocrit?
a. 21% to 24%
b. 23.7% to 24.3%
c. 24% to 27%
d. 21% to 27%
d. 21% to 27%
- Calculate the MCV and MCHC for the following values: RBCs 5 5.00 3 1012/L HGB 5 9 g/dL HCT 5 30% MCV (fL) MCHC (g/dL)
a. 30 18
b. 60 30
c. 65 33
d. 85 35
b. 60 30
- What does the reticulocyte count assess?
a. Inflammation
b. Response to infection
c. Erythropoietic activity of the bone
marrow
d. Ability of red blood cells to form rouleaux
c. Erythropoietic activity of the bone
marrow
- For a patient with the following test results, which measure of bone marrow red blood cell production provides the most accurate information? Observed
reticulocyte count 5 5.3% HCT 5 35%
Morphology—moderate polychromasia
a. Observed reticulocyte count
b. Corrected reticulocyte count
c. RPI
d. ARC
c. RPI
- Given the following values, calculate the RPI: Observed reticulocyte count 5 6% HCT 5 30%
a. 2
b. 3
c. 4
d. 5
a. 2
- Which of the following would be associated with an elevated ESR value?
a. Microcytosis
b. Polycythemia
c. Decreased globulins
d. Inflammation
d. Inflammation
- Which printout lets the end user know at a glance that the results are acceptable and no manual work needs to be performed?
a. CELL-DYN Sapphire
b. UniCel DxH 800
c. ADVIA 2120i
d. Sysmex XN-series
d. Sysmex XN-series
- Which instrument printout has a system flag on the platelet count?
a. CELL-DYN Sapphire
b. UniCel DxH 800
c. ADVIA 2120i
d. XN-series
a. CELL-DYN Sapphire