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

$$\text{Hematocrit} = \frac{\text{RBC Volume}}{\text{Total Blood Volume}} \times 100$$

Question 1

Which of the following best describes the primary function of erythrocytes in the blood?

Accepted Answer

To transport oxygen and carbon dioxide between the lungs and tissues

Question 2

A patient presents with fatigue, pallor, and shortness of breath. Laboratory results show a hematocrit of 30%. Which condition is most likely present?

Accepted Answer

Anemia

Question 3

Which of the following is a direct result of the absence of mitochondria in mature erythrocytes?

Accepted Answer

Erythrocytes do not consume the oxygen they transport

Question 4

A person with type AB blood is considered a universal recipient for transfusions. Which of the following best explains why?

Accepted Answer

They have neither anti-A nor anti-B antibodies in their plasma

Question 5

Which of the following equations correctly represents the relationship between hematocrit, red blood cell volume, and total blood volume?

Accepted Answer

$$	ext{Hematocrit} = \frac{	ext{RBC Volume}}{	ext{Total Blood Volume}} 	imes 100$$

Question 6

A patient with chronic kidney disease develops anemia. Which hormone deficiency is most likely responsible?

Accepted Answer

Erythropoietin

Question 7

Which of the following best describes the process of diapedesis?

Accepted Answer

The migration of leukocytes out of the bloodstream into tissues

Question 8

A patient is diagnosed with sickle-cell anemia. Which of the following best explains the molecular basis of this disease?

Accepted Answer

A single amino acid substitution in the beta chain of hemoglobin causes RBCs to sickle under low oxygen

Question 9

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

Accepted Answer

Vascular spasm, platelet plug formation, coagulation

Question 10

A patient receives a transfusion of mismatched blood and develops fever, chills, and hemoglobinuria. Which process is responsible for these symptoms?

Accepted Answer

Agglutination and hemolysis of donor erythrocytes by recipient antibodies

Question 11

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 in the liver

Question 12

Which white blood cell type is most abundant in normal blood and is primarily responsible for phagocytosis of bacteria?

Accepted Answer

Neutrophil

Question 13

A patient with a history of deep vein thrombosis is prescribed warfarin. What is the mechanism of action of this drug?

Accepted Answer

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

Question 14

Which of the following best describes the fate of the heme group from hemoglobin after erythrocyte destruction?

Accepted Answer

It is converted to bilirubin and excreted in bile

Question 15

A patient with a platelet count of 40,000/μL presents with widespread petechiae. Which condition is most likely?

Accepted Answer

Thrombocytopenia

Question 16

Which of the following best explains why individuals with sickle-cell trait (heterozygous for HbS) have a survival advantage in malaria-endemic regions?

Accepted Answer

Sickled cells are destroyed more rapidly, reducing parasite load

Question 17

Which of the following is a function of albumin in blood plasma?

Accepted Answer

Acts as a blood buffer and maintains osmotic pressure

Question 18

A patient with hemophilia A is deficient in which clotting factor?

Accepted Answer

Factor VIII

Question 19

Which of the following best describes the role of plasmin in the body?

Accepted Answer

It digests fibrin and dissolves blood clots

Question 20

A patient with a history of repeated infections is found to have a WBC count of 2,000/μL. Which term best describes this finding?

Accepted Answer

Leukopenia

Blood: Structure, Function, and Clinical Significance

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