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Leukopenia is a disorder resulting from conditions like HIV and aplastic anemia that causes levels of white blood cells to drop below the normal standard. Which of the following white blood cell counts suggests leukopenia?


A) 5,000 WBCs per microliter of blood
B) 3,000 WBCs per microliter of blood
C) 3,900 WBCs per microliter of blood
D) 10,000 WBCs per microliter of blood

E) All of the above
F) B) and C)

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The release of tissue thromboplastin initiates


A) the intrinsic clotting mechanism.
B) the extrinsic clotting mechanism.
C) platelet plug formation.
D) hemolysis.

E) C) and D)
F) A) and B)

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What is the difference between serum and plasma?


A) Plasma contains calcium; serum does not.
B) Plasma does not have blood cells; serum does.
C) Plasma contains fibrinogen; serum does not.
D) Plasma contains albumin; serum does not.

E) A) and D)
F) A) and C)

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Which of the following are most active as phagocytes?


A) Erythrocytes
B) Neutrophils
C) Basophils
D) Eosinophils

E) B) and D)
F) B) and C)

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The biconcave cells in blood that lack nuclei when they are mature are the


A) white blood cells.
B) red blood cells.
C) platelets.
D) macrophages.

E) All of the above
F) A) and B)

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While looking at a sample of blood in a microscope, you see a purple-stained cell that is markedly larger than a red blood cell (about two to three times larger) . It has a large kidney-shaped nucleus. What type of blood cell is this?


A) A monocyte
B) An eosinophil
C) A basophil
D) A neutrophil

E) All of the above
F) B) and C)

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In leukemia,


A) the blood has too many immature leukocytes.
B) the body doesn't produce enough red blood cells.
C) red blood cells become occupied by parasites.
D) red blood cells are misshapen and become lodged in capillaries.

E) B) and C)
F) B) and D)

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The normal white blood cell count is ________ cells per microliter of blood.


A) 500
B) 4,500
C) 45,000
D) 5,000,000

E) B) and C)
F) None of the above

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The final step in the formation of a blood clot is


A) the formation of prothrombin activator.
B) the conversion of fibrinogen to fibrin by thrombin.
C) the conversion of prothrombin to thrombin by prothrombin activator.
D) tissue damage.

E) A) and B)
F) A) and C)

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The red blood cells of type AB blood have on their surfaces


A) antigens A and B.
B) antigen A only.
C) antigen B only.
D) neither antigens A nor B.

E) A) and C)
F) All of the above

Correct Answer

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The formed elements in the blood are


A) mostly red blood cells.
B) mostly white blood cells.
C) mostly platelets.
D) about equal numbers of red blood cells, white blood cells, and platelets.

E) A) and B)
F) B) and C)

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