Q: Which of the following equations correctly represents the relationship between hematocrit (Hct), red blood cell volume (RBCV), and total blood volume (TBV)?

$$Hct = \frac{RBCV}{TBV} \times 100\%$$

Question 1

Which plasma protein is primarily responsible for maintaining the osmotic pressure of blood, and what would be a likely consequence if its concentration dropped significantly?

Accepted Answer

Albumin; fluid would move from blood vessels into tissues, causing edema

Question 2

A patient with chronic kidney disease is found to have a low red blood cell count. Which hormone is most likely deficient, and what is its primary site of production?

Accepted Answer

Erythropoietin; produced mainly by the kidneys

Question 3

Which of the following best explains why mature erythrocytes (RBCs) are anucleate and lack mitochondria?

Accepted Answer

To allow more room for hemoglobin and enable anaerobic ATP production, preventing oxygen consumption

Question 4

A person with blood type O negative requires a transfusion. Which of the following blood types is safest to administer?

Accepted Answer

O negative

Question 5

During the process of hemostasis, which step involves the conversion of soluble fibrinogen into insoluble fibrin strands, and which enzyme catalyzes this reaction?

Accepted Answer

Coagulation; thrombin

Question 6

A patient develops petechiae and prolonged bleeding after minor trauma. Laboratory tests reveal a low platelet count. What is the most likely diagnosis?

Accepted Answer

Thrombocytopenia

Question 7

Which of the following best describes the role of the fibrinolytic system in hemostasis?

Accepted Answer

It dissolves the clot after tissue repair by converting plasminogen to plasmin

Question 8

A patient with liver failure is at increased risk of bleeding. Which of the following best explains this phenomenon?

Accepted Answer

The liver synthesizes most clotting factors required for coagulation

Question 9

Which of the following equations correctly represents the relationship between hematocrit (Hct), red blood cell volume (RBCV), and total blood volume (TBV)?

Accepted Answer

$$Hct = \frac{RBCV}{TBV} 	imes 100\%$$

Question 10

A patient with type A blood receives type B blood in error. Which of the following best describes the immediate immunological response?

Accepted Answer

The recipient's anti-B antibodies will agglutinate the donor's RBCs, leading to hemolysis

Question 11

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

Accepted Answer

Vitamin K is required for the synthesis of several clotting factors in the liver

Question 12

Which of the following statements about hemoglobin is correct?

Accepted Answer

Each hemoglobin molecule can bind up to four oxygen molecules because it contains four heme groups

Question 13

A patient at high altitude develops secondary polycythemia. Which of the following best explains the physiological mechanism?

Accepted Answer

Increased erythropoietin production in response to hypoxia stimulates RBC production

Question 14

Which of the following best describes the difference between intrinsic and extrinsic pathways of coagulation?

Accepted Answer

Intrinsic pathway is triggered by negatively charged surfaces within the blood, while extrinsic pathway is triggered by tissue factor from damaged tissue outside the blood

Question 15

Which of the following is a function of platelets in hemostasis?

Accepted Answer

They release serotonin and ADP to promote vasoconstriction and platelet aggregation

Question 16

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

Accepted Answer

The mother's anti-Rh antibodies cross the placenta and destroy the fetal Rh+ RBCs

Question 17

Which of the following best describes the fate of iron from degraded hemoglobin after erythrocyte destruction?

Accepted Answer

It is stored as ferritin or hemosiderin in the liver and reused for erythropoiesis

Question 18

Which of the following equations correctly represents the oxygen-carrying capacity of blood, given that each hemoglobin molecule can bind four oxygen molecules and each RBC contains approximately $$2.5 	imes 10^8$ hemoglobin molecules?

Accepted Answer

$$	ext{O}_2	ext{-carrying capacity per RBC} = 4 	imes 2.5 	imes 10^8$$

Question 19

Which of the following best explains why nitric oxide and prostacyclin are important in the vascular endothelium?

Accepted Answer

They inhibit platelet aggregation and maintain smooth blood flow

Blood: Structure, Function, and Clinical Relevance

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