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

$$\text{Prothrombin} + \text{Factor V} + \text{Factor X} \rightarrow \text{Thrombin}$$

Question 1

Which of the following best explains why erythrocytes are highly efficient at gas exchange?

Accepted Answer

They have a biconcave disc shape, increasing surface area-to-volume ratio.

Question 2

A patient is exposed to carbon monoxide (CO). Which statement best describes the danger of CO exposure in terms of hemoglobin binding?

Accepted Answer

CO binds to hemoglobin and forms carboxyhemoglobin, preventing oxygen from binding.

Question 3

Which plasma protein is primarily responsible for maintaining blood osmotic pressure?

Accepted Answer

Albumin

Question 4

A person with pernicious anemia is most likely to have a deficiency in which vitamin, and what is the consequence for erythrocyte production?

Accepted Answer

Vitamin B12; impaired DNA synthesis in dividing cells

Question 5

Which leukocyte is most abundant in blood and is primarily responsible for phagocytosing bacteria at sites of infection?

Accepted Answer

Neutrophil

Question 6

During hemostasis, which step involves the conversion of fibrinogen to fibrin, forming a mesh that stabilizes the platelet plug?

Accepted Answer

Coagulation

Question 7

A patient with sickle cell anemia has erythrocytes with abnormal hemoglobin. What is the genetic basis for this disease?

Accepted Answer

Two copies of a defective gene causing hemoglobin S (HbS) production

Question 8

Which of the following is TRUE regarding platelets?

Accepted Answer

They are fragments of megakaryocytes and play a key role in hemostasis.

Question 9

Which pathway in the coagulation cascade is activated when blood contacts a negatively charged surface, such as a test tube?

Accepted Answer

Intrinsic pathway

Question 10

A patient with hemophilia A is unable to form clots efficiently. Which clotting factor is deficient in this disorder?

Accepted Answer

Factor VIII

Question 11

Which plasma protein is involved in transporting hydrophobic molecules such as lipids and fat-soluble vitamins?

Accepted Answer

Globulin

Question 12

If a person has polycythemia due to living at high altitude, what is the physiological reason for increased hematocrit?

Accepted Answer

Decreased oxygen availability stimulates erythropoietin production.

Question 13

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

Accepted Answer

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

Question 14

Which cell type is responsible for producing antibodies in response to specific antigens?

Accepted Answer

B-lymphocytes

Question 15

During the process of erythropoiesis, which hormone stimulates the production of erythrocytes in the bone marrow?

Accepted Answer

Erythropoietin

Question 16

Which of the following best describes the role of fibrinogen in blood clotting?

Accepted Answer

It is converted to fibrin, which forms a mesh to stabilize the clot.

Question 17

A patient with abnormal bleeding is found to have a deficiency in vitamin K. Which step in the coagulation cascade is most directly affected?

Accepted Answer

Activation of factors II, VII, IX, and X

Question 18

Which of the following equations correctly represents the conversion of prothrombin to thrombin in the common pathway of coagulation?

Accepted Answer

$$	ext{Prothrombin} + 	ext{Factor V} + 	ext{Factor X} ightarrow 	ext{Thrombin}$$

Question 19

Which leukocyte type is primarily involved in mediating inflammation by releasing histamine and other chemicals?

Accepted Answer

Basophil

Question 20

A patient has a high white blood cell count with abnormal cells present. Which condition is most likely?

Accepted Answer

Leukemia

Comprehensive Study Notes: Blood (Anatomy & Physiology)

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