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WorksheetsHematology, Rodaks, 1
Total questions: 38
Worksheet time: 19mins
The megakaryocyte progenitor that undergoes endomitosis is:
MK-I
BFU-Meg
CFU-Meg
LD-CFU-Meg
The growth factor that is produced in the kidney and induces growth and differentiation of committed megakaryocyte progenitors is:
IL-3
IL-6
IL-11
TPO
What platelet organelle sequesters ionic calcium and binds a series of enzymes of the eicosanoid pathway?
Dense granules
Alpha-Granules
Dense Tubular System
SCCS
What platelet membrane receptor binds fibrinogen and
supports platelet aggregation?
GP Ib/IX/V
GP IIb/IIIa
GP Ia/IIa
P2Y1
What platelet membrane phospholipid flips from the inner
surface to the plasma surface on activation and serves as the assembly point for coagulation factors?
Phosphatidylethanolamine
Phosphatidylinositol
Phosphatidylcholine
Phosphatidylserine
What is the name of the eicosanoid metabolite produced from endothelial cells that suppresses platelet activity?
TXA2
Arachidonic Acid
COX-1
Prostacyclin
PGI2
Which of the following molecules is stored in platelet dense granules?
Serotonin
Fibrinogen
Platelet Factor 4
Platelet-derived growth factor
What plasma protein is essential to platelet adhesion?
VWF
Factor VIII
Fibrinogen
P-selectin
Reticulated platelets can be enumerated in peripheral blood to detect:
Impaired production in disease states
Abnormal organelles associated with diseases such as
leukemia
Increased platelet production in response to need
Inadequate rates of membrane cholesterol exchange with the plasma
Platelet adhesion refers to platelets:
Sticking to other platelets
Releasing platelet granule constituents
Providing the surface for assembly of coagulation factors
Sticking to surfaces such as subendothelial collagen
What intimal cell synthesizes and stores VWF?
Smooth muscle cell
Endothelial cell
Fibroblast
Platelet
What subendothelial structural protein triggers coagulation through activation of factor VII?
Thrombomodulin
Nitric oxide
Tissue factor
Thrombin
What coagulation plasma protein should be assayed when platelets fail to aggregate properly?
Factor VIII
Fibrinogen
Thrombin
Factor X
What role does vitamin K play for the prothrombin group
factors?
Provides a surface on which the proteolytic reactions of the factors occur
Protects them from inappropriate activation by compounds such as thrombin
Accelerates the binding of the serine proteases and their cofactors
Carboxylates the factors to allow calcium binding
What is the source of fibrinopeptides A and B?
Plasmin proteolysis of fibrin polymer
Thrombin proteolysis of fibrinogen
Proteolysis of prothrombin by factor Xa
Plasmin proteolysis of cross-linked fibrin
What serine protease forms a complex with factor VIIIa, and what is the substrate of this complex?
Factor VIIa, factor X
Factor Va, prothrombin
Factor Xa, prothrombin
Factor IXa, factor X
What protein secreted by endothelial cells activates fibrinolysis?
Plasminogen
Tissue plasminogen activator (TPA)
Plasminogen activator inhibitor-1 (PAI-1)
Carboxypeptidase B2 (CPB2) / (TAFI)
What two regulatory proteins form a complex that digests activated factors V and VIII?
TFPI and Xa
Antithrombin and protein C
Activated protein C (APC) and protein S
Thrombomodulin and plasmin
Coagulation factor VIII circulates bound to:
VWF
Factor IX
Platelets
Factor V
Most coagulation factors are synthesized in:
The liver
Monocytes
Endothelial cells
Megakaryocytes
Iron is transported in plasma via:
Hemosiderin
Ferritin
Transferrin
Hemoglobin
What is the major metabolically available storage form of iron in the body?
Hemosiderin
Ferritin
Transferrin
Hemoglobin
The total iron-binding capacity (TIBC) of the serum is an indirect measure of which iron-related protein?
Hemosiderin
Ferritin
Transferrin
Hemoglobin
For a patient with classic iron study values that are equivocal for iron deficiency, which of the following tests would be most helpful in determining whether iron deficiency is present or not?
Zinc protoporphyrin
Peripheral blood sideroblast assessment
Soluble transferrin receptor
Mean cell hemoglobin
What membrane-associated protein in enterocytes transports iron from the intestinal lumen into the enterocyte?
Transferrin
Ferroportin
DMT1
Ferrochelatase
Iron is transported out of macrophages, hepatocytes, and enterocytes by what membrane protein?
Transferrin
Ferroportin
DMT1
Ferrochelatase
Below are several of the many steps in the process from absorption and transport of iron to incorporation into heme. Place them in proper order.
i) Transferrin picks up ferric iron.
ii) Iron is transferred to the mitochondria.
iii) DMT1 transports ferrous iron into the enterocyte.
iv) Ferroportin transports iron from enterocyte to plasma.
v) The transferrin receptor transports iron into the cell.
v, iv, i, ii, iii
iii, ii, iv, i, v
ii, i, v, iii, iv
iii, iv, i, v, ii
What is the fate of the transferrin receptor when it has completed its role in the delivery of iron to a cell?
It is recycled to the plasma membrane and released into the plasma.
It is recycled to the plasma membrane, where it can bind its ligand again.
It is catabolized and the amino acids are returned to the metabolic pool.
It is retained in the endosome for the life span of the cell.
The transfer of iron from the enterocyte into the plasma is REGULATED by:
Transferrin
Ferroportin
Hephaestin
Hepcidin
Into which quadrant of a Thomas plot would a patient’s results fall with the following test results:
Soluble transferrin receptor: increased above reference interval Ferritin: decreased below reference interval
Hemoglobin content of reticulocytes: within the reference interval
Normal iron status
Latent iron deficiency
Functional iron deficiency
Iron deficiency
A physician is concerned that a patient is developing iron deficiency from chronic intestinal bleeding due to aspirin use for rheumatoid arthritis. The iron studies on the patient show the following results above. How would these results be interpreted?
Latent iron deficiency
Functional iron deficiency
Iron deficiency
Equivocal for iron deficiency
During the second trimester of fetal development, the primary site of blood cell production is the:
Bone marrow
Spleen
Lymph nodes
Liver
The best source of active bone marrow from a 20-year-old would be:
Iliac crest
Femur
Distal radius
Tibia
Which one of the following morphologic changes occurs during normal blood cell maturation:
Increase in cell diameter
Development of cytoplasm basophilia
Condensation of nuclear chromatin
Appearance of nucleoli
Which one of the following cells is a product of the CLP?
Megakaryocyte
T lymphocyte
Erythrocyte
Granulocyte
Which one of the following cytokines is required very early
in the differentiation of a hematopoietic stem cell?
IL-2
IL-8
EPO
FLT3 Ligand
When a patient has severe anemia and the bone marrow is unable to effectively produce red blood cells to meet the increased demand, one of the body’s responses is:
Extramedullary hematopoiesis in the liver and spleen
Decreased production of erythropoietin by the kidney
Increased apoptosis of erythrocyte progenitor cells
Increase the proportion of yellow marrow in the long bones
Hematopoietic stem cells produce all lineages of blood cells in sufficient quantities over the lifetime of an individual because they:
Are unipotent
Have the ability of self-renewal by asymmetric division
Are present in large numbers in the bone marrow niches
Have a low mitotic potential in response to growth
factors
