Question 1

Which of the following best describes the primary mechanism by which monocytes stimulate lymphocytes during an immune response?

Accepted Answer

By engulfing pathogens, breaking them into antigens, and presenting these antigens to activate T-lymphocytes.

Question 2

Which of the following is TRUE regarding the production and life span of granulocytes compared to erythrocytes?

Accepted Answer

Granulocytes are produced in greater quantities than erythrocytes because they have a shorter life span.

Question 3

A patient presents with a high number of abnormal, nonfunctional white blood cells, anemia, and frequent infections. Which disorder is most likely?

Accepted Answer

Leukemia

Question 4

Which clotting factor is directly responsible for converting fibrinogen into fibrin during coagulation?

Accepted Answer

Thrombin (Factor IIa)

Question 5

Which vitamin is essential for the synthesis of several clotting factors, and what is the consequence of its deficiency?

Accepted Answer

Vitamin K; impaired blood clotting and increased bleeding risk

Question 6

A patient with a deficiency in antihemophilic factor (Factor VIII) is most likely to have which condition?

Accepted Answer

Hemophilia A

Question 7

Which of the following best explains why heparin is used clinically as an anticoagulant?

Accepted Answer

It increases the activity of antithrombin III, which inactivates thrombin and other clotting factors.

Question 8

Which pathway of the coagulation cascade is triggered by exposure to tissue factor (TF) and is considered the faster pathway?

Accepted Answer

Extrinsic pathway

Question 9

A patient with petechiae, spontaneous bleeding, and a platelet count below 50,000/μL is most likely suffering from:

Accepted Answer

Thrombocytopenia

Question 10

Which of the following best describes the process of fibrinolysis?

Accepted Answer

The breakdown of fibrin clots by plasmin, which is activated from plasminogen by tissue plasminogen activator.

Question 11

Which of the following is a major difference between acute and chronic leukemia?

Accepted Answer

Acute leukemia involves rapid proliferation of stem cells and primarily affects children, while chronic leukemia involves proliferation of later cell stages and is more common in older adults.

Question 12

Which of the following best explains why patients with liver disease are at increased risk for bleeding disorders?

Accepted Answer

The liver is responsible for producing most clotting factors, and liver disease impairs this synthesis.

Question 13

Which of the following is the correct sequence of events in hemostasis?

Accepted Answer

Vascular spasm → Platelet plug formation → Coagulation

Question 14

A thrombus that breaks free and travels through the bloodstream is called:

Accepted Answer

An embolus

Question 15

Which of the following blood tests is used to assess the extrinsic pathway of coagulation and is often reported as an international normalized ratio (INR)?

Accepted Answer

Prothrombin time (PT)

Question 16

Which of the following statements about the ABO blood group system is correct?

Accepted Answer

Type AB individuals have no antibodies against A or B antigens in their plasma.

Question 17

A newborn develops hemolytic disease due to Rh incompatibility. Which of the following best explains the pathophysiology?

Accepted Answer

The mother is Rh-negative and has developed anti-Rh antibodies that cross the placenta and destroy fetal Rh-positive erythrocytes.

Question 18

Which of the following is a function of von Willebrand factor in hemostasis?

Accepted Answer

It promotes platelet-collagen adhesion at sites of vessel injury.

Question 19

Which of the following best describes the role of prostacyclin and nitric oxide in blood vessels?

Accepted Answer

They prevent platelet adhesion to intact endothelium, reducing unwanted clot formation.

Question 20

A patient is prescribed warfarin after a stroke. What is the primary mechanism by which warfarin acts as an anticoagulant?

Accepted Answer

It inhibits the synthesis of vitamin K-dependent clotting factors.

Blood: Leukocytes, Hemostasis, and Blood Disorders

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