Question 1

Which of the following best describes the primary function of albumin, the most abundant plasma protein, in human blood?

Accepted Answer

It maintains osmotic pressure and transports substances such as hormones and drugs.

Question 2

A patient presents with a hematocrit of 65%. Which of the following best explains the physiological significance of this finding?

Accepted Answer

It suggests polycythemia, which can increase blood viscosity and risk of thrombosis.

Question 3

Which of the following correctly matches a blood cell type with its primary function?

Accepted Answer

Platelets: formation of blood clots to prevent blood loss

Question 4

During hematopoiesis in adults, which anatomical site is primarily responsible for the production of new blood cells?

Accepted Answer

Red bone marrow

Question 5

A patient with iron-deficiency anemia is likely to have which of the following laboratory findings?

Accepted Answer

Decreased hemoglobin concentration

Question 6

Which of the following best describes the structure of hemoglobin?

Accepted Answer

Four polypeptide chains, each with a heme group capable of binding one $$\mathrm{O}_2$$ molecule

Question 7

Which of the following is the correct sequence for the three major steps of hemostasis?

Accepted Answer

Vascular spasm, platelet plug formation, coagulation

Question 8

A patient with sickle cell disease experiences episodes of pain due to vaso-occlusion. Which aspect of hemoglobin structure is primarily responsible for this pathology?

Accepted Answer

A mutation in the beta-globin chain causing hemoglobin to polymerize under low oxygen conditions

Question 9

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

Accepted Answer

It promotes the maturation of erythrocyte precursors in the bone marrow.

Question 10

Which of the following statements about the coagulation cascade is correct?

Accepted Answer

Both the intrinsic and extrinsic pathways converge at the activation of factor X, leading to the common pathway.

Question 11

Which of the following best explains why a deficiency in vitamin K can lead to excessive bleeding?

Accepted Answer

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

Question 12

A laboratory report shows a patient has an increased reticulocyte count. Which of the following is the most likely explanation?

Accepted Answer

The patient is experiencing increased erythropoiesis, possibly due to blood loss or hemolysis.

Question 13

Which of the following best describes the process of fibrinolysis?

Accepted Answer

The breakdown of the fibrin clot by plasmin, which is activated from plasminogen by tissue plasminogen activator

Question 14

Which of the following is a key difference between reticulocytes and mature erythrocytes?

Accepted Answer

Reticulocytes contain residual ribosomal RNA, while mature erythrocytes do not.

Question 15

Which of the following best describes the fate of iron after the breakdown of aged erythrocytes?

Accepted Answer

It is stored in the liver as ferritin or hemosiderin and recycled for new hemoglobin synthesis.

Question 16

Which of the following is NOT a component measured in a standard complete blood count (CBC)?

Accepted Answer

Blood glucose concentration

Question 17

A patient with hereditary spherocytosis has red blood cells that are spherical rather than biconcave. Which of the following is a likely consequence of this abnormality?

Accepted Answer

Decreased flexibility, leading to premature destruction in the spleen

Question 18

Which of the following best describes the positive feedback loop in platelet activation during hemostasis?

Accepted Answer

Activated platelets release chemicals that recruit and activate more platelets, amplifying the response.

Question 19

Which of the following best explains why the convergence of the intrinsic and extrinsic pathways at the common pathway is significant in the coagulation cascade?

Accepted Answer

It ensures that clot formation can occur even if one pathway is impaired.

Question 20

Which of the following ions is essential for several steps in the coagulation cascade?

Accepted Answer

Calcium ($$\mathrm{Ca}^{2+})$$

Chapter 17: Blood – Structure, Function, and Hemostasis

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