$\text{HCT} = \frac{\text{Volume of RBCs}}{\text{Total Blood Volume}} \times 100$

Question 1

Which of the following best describes the function of packed cell volume (PCV) in clinical diagnostics?

Accepted Answer

It determines the proportion of blood volume occupied by red blood cells, aiding in the diagnosis of anemia and polycythemia.

Question 2

A patient presents with jaundice and anemia. Which of the following best explains the pathophysiology behind these symptoms?

Accepted Answer

Hemolysis of red blood cells releases hemoglobin, which is converted to bilirubin, causing jaundice.

Question 3

Which equation correctly represents the calculation of hematocrit (HCT)?

Accepted Answer

$	ext{HCT} = \frac{	ext{Volume of RBCs}}{	ext{Total Blood Volume}} 	imes 100$

Question 4

Which of the following is NOT a function of blood proteins?

Accepted Answer

Initiation of muscle contraction

Question 5

A newborn is diagnosed with hemolytic disease due to blood group incompatibility. Which blood cell type is primarily affected?

Accepted Answer

Red blood cells

Question 6

Which of the following best describes the role of erythropoietin in erythropoiesis?

Accepted Answer

It promotes the maturation and proliferation of red blood cell precursors in the bone marrow.

Question 7

Which of the following is a correct sequence in the life cycle of a red blood cell?

Accepted Answer

Bone marrow → Circulation → Spleen (destruction by macrophages)

Question 8

Which form of hemoglobin has the highest affinity for oxygen?

Accepted Answer

Oxyhemoglobin

Question 9

A patient with polycythemia is likely to have which of the following laboratory findings?

Accepted Answer

Increased packed cell volume

Question 10

Which of the following best explains the importance of calcium ions in the blood clotting process?

Accepted Answer

Calcium ions are required for the activation of several clotting factors in both intrinsic and extrinsic pathways.

Question 11

Which statement best describes the difference between intrinsic and extrinsic pathways of blood clotting?

Accepted Answer

Intrinsic pathway is activated by factors within the blood, while extrinsic pathway is triggered by tissue factor from damaged tissues.

Question 12

Which of the following is a function of thrombopoietin?

Accepted Answer

Regulates the formation of platelets from megakaryocytes

Question 13

Which of the following best describes the role of antithrombin III in blood clotting?

Accepted Answer

It inhibits thrombin and other clotting factors, preventing excessive clot formation.

Question 14

Which equation correctly represents the conversion of fibrinogen to fibrin during coagulation?

Accepted Answer

$	ext{Fibrinogen} + 	ext{Thrombin} ightarrow 	ext{Fibrin}$

Question 15

A patient with thrombocytopenia is at increased risk for which of the following?

Accepted Answer

Prolonged bleeding due to insufficient platelet plug formation

Question 16

Which of the following best describes the feedback control of blood clotting involving protein C?

Accepted Answer

Protein C inactivates factors Va and VIIIa, limiting clot formation.

Question 17

Which of the following is a structural difference between neutrophils and lymphocytes?

Accepted Answer

Neutrophils have a multilobed nucleus, while lymphocytes have a large, round nucleus.

Question 18

Which of the following best explains the importance of Vitamin B12 in erythropoiesis?

Accepted Answer

Vitamin B12 is required for DNA synthesis in red blood cell precursors.

Question 19

A patient with disseminated intravascular coagulation (DIC) is likely to experience which of the following?

Accepted Answer

Uncontrolled bleeding due to consumption of clotting factors and platelets

Question 20

Which of the following best describes the role of the spleen in the life cycle of red blood cells?

Accepted Answer

The spleen stores platelets and destroys old or damaged red blood cells via macrophages.

Blood: Composition, Functions, and Hematology Study Guide

Study Guide - Practice Questions