Q: Which of the following is the correct formula for calculating hematocrit ($$H) $$given the volume of red blood cells ($$V_{RBC}) $$and the total blood volume ($$V_{total}$$)?

$$H = \frac{V_{RBC}}{V_{total}} \times 100\%$$

Question 1

Which of the following best describes the sequence of events in hemostasis following a blood vessel injury?

Accepted Answer

Vascular spasm, platelet plug formation, coagulation

Question 2

A patient with a deficiency in von Willebrand factor would most likely have impaired:

Accepted Answer

Platelet plug formation

Question 3

During the coagulation cascade, which of the following correctly matches the phase with its main event?

Accepted Answer

Phase 2: Prothrombin is converted to thrombin

Question 4

A person with blood type O negative ($$O^-) is $$considered a universal donor because:

Accepted Answer

Their red blood cells lack both A, B, and Rh antigens

Question 5

Which of the following best explains why vitamin K deficiency can lead to bleeding disorders?

Accepted Answer

Vitamin K is required for the synthesis of several clotting factors

Question 6

A thrombus differs from an embolus in that a thrombus:

Accepted Answer

Is a clot that forms and remains in an unbroken blood vessel

Question 7

A patient with hemophilia A is most likely to have a deficiency in which clotting factor?

Accepted Answer

Factor VIII

Question 8

Which of the following is the correct formula for calculating hematocrit ($$H) $$given the volume of red blood cells ($$V_{RBC}) $$and the total blood volume ($$V_{total}$$)?

Accepted Answer

$$H = \frac{V_{RBC}}{V_{total}} 	imes 100\%$$

Question 9

A woman with blood type O negative ($$O^-) is $$pregnant with a fetus who is Rh positive ($$Rh^+). $$Which of the following best describes the risk to the fetus in subsequent pregnancies?

Accepted Answer

The mother may develop anti-Rh antibodies that can cross the placenta and destroy fetal red blood cells, causing hemolytic disease of the newborn

Question 10

Which of the following drugs acts as an antiprostaglandin to inhibit thromboxane A$$_2$$ and reduce platelet aggregation?

Accepted Answer

Aspirin

Question 11

A patient presents with petechiae and a platelet count of 40,000/$$\muL. $$Which condition is most likely?

Accepted Answer

Thrombocytopenia

Question 12

Which of the following best describes the role of thrombin in the coagulation cascade?

Accepted Answer

Thrombin converts soluble fibrinogen into insoluble fibrin strands

Question 13

A transfusion reaction occurs when:

Accepted Answer

Recipient antibodies agglutinate donor red blood cells

Question 14

Which of the following is a correct statement about the extrinsic pathway of coagulation?

Accepted Answer

It is triggered by tissue factor released from damaged tissues

Question 15

Which diagnostic test would be most appropriate to assess the ability of a patient's blood to clot?

Accepted Answer

Prothrombin time

Question 16

A patient with a history of atrial fibrillation is prescribed warfarin. What is the primary mechanism by which warfarin acts as an anticoagulant?

Accepted Answer

It interferes with the action of vitamin K, reducing synthesis of clotting factors

Question 17

Which of the following best explains why packed red blood cells are often used in transfusions instead of whole blood?

Accepted Answer

Packed red blood cells restore oxygen-carrying capacity without increasing blood volume excessively

Question 18

Which of the following is the correct sequence for the removal of a clot after vessel healing?

Accepted Answer

Fibrinolysis by plasmin

Question 19

A patient receives a transfusion of type A blood but is type B. What is the most likely immediate consequence?

Accepted Answer

Agglutination and destruction of donor red blood cells

Question 20

Which of the following best describes the function of platelet-derived growth factor (PDGF) during vessel repair?

Accepted Answer

It stimulates division of smooth muscle cells and fibroblasts to rebuild the vessel wall

Blood: Hemostasis, Blood Typing, and Transfusion in Human Anatomy & Physiology II

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