Q: Which of the following equations best represents the conversion of prothrombin to thrombin during blood clotting?

$$\text{Prothrombin} \xrightarrow{\text{Clotting Factors}} \text{Thrombin}$$

Q: Which equation best represents the binding capacity of hemoglobin in a single erythrocyte?

$$250,000,000 \text{ Hb molecules} \times 4 \text{ O}_2 \text{ per Hb} = 1,000,000,000 \text{ O}_2 \text{ molecules}$$

Question 1

Which plasma protein is primarily responsible for maintaining osmotic balance and buffering pH in blood?

Accepted Answer

Albumin

Question 2

A patient with a genetic mutation in the PCSK9 gene is found to have lower plasma LDL cholesterol levels. Based on the histogram data, what is the most likely effect of this mutation on their risk of developing atherosclerosis?

Accepted Answer

The risk is decreased due to lower LDL levels.

Question 3

Which blood component is most directly involved in the formation of a blood clot after injury?

Accepted Answer

Platelets

Question 4

What is the primary function of erythrocytes in vertebrate blood?

Accepted Answer

Transport of O$$_2$$ and some CO$$_2$$

Question 5

A patient with sickle-cell disease experiences severe pain and organ swelling. Which of the following best explains these symptoms?

Accepted Answer

Sickled erythrocytes block arterioles and capillaries, preventing O$$_2$$ delivery.

Question 6

Which of the following equations best represents the conversion of prothrombin to thrombin during blood clotting?

Accepted Answer

$$	ext{Prothrombin} \xrightarrow{	ext{Clotting Factors}} 	ext{Thrombin}$$

Question 7

Which cell type is produced from lymphoid progenitor cells in the bone marrow?

Accepted Answer

Lymphocytes

Question 8

A patient is diagnosed with hemophilia. Which step in the blood clotting process is most likely impaired?

Accepted Answer

Conversion of fibrinogen to fibrin

Question 9

Which of the following is a major function of leukocytes?

Accepted Answer

Defense and immunity

Question 10

Which hormone is secreted by the kidneys in response to low O$$_2$$ levels to stimulate erythrocyte production?

Accepted Answer

Erythropoietin (EPO)

Question 11

A patient with a high LDL/HDL ratio is at increased risk for which cardiovascular condition?

Accepted Answer

Atherosclerosis

Question 12

Which of the following best describes the positive feedback loop in blood clotting?

Accepted Answer

Thrombin stimulates more conversion of prothrombin to thrombin.

Question 13

Which of the following substances is transported by plasma and is essential for muscle and nerve activity?

Accepted Answer

Inorganic ions (electrolytes)

Question 14

What is the effect of aspirin on cardiovascular disease risk, based on its mechanism of action?

Accepted Answer

It inhibits the inflammatory response, reducing thrombus formation.

Question 15

Which of the following best explains why mature mammalian erythrocytes lack mitochondria?

Accepted Answer

To maximize space for hemoglobin and prevent O$$_2$$ consumption by the cell.

Question 16

A stent is inserted into a coronary artery to treat which condition?

Accepted Answer

Atherosclerosis causing arterial blockage

Question 17

Which equation best represents the binding capacity of hemoglobin in a single erythrocyte?

Accepted Answer

$$250,000,000 	ext{ Hb molecules} 	imes 4 	ext{ O}_2 	ext{ per Hb} = 1,000,000,000 	ext{ O}_2 	ext{ molecules}$$

Question 18

Which of the following is a direct consequence of chronic hypertension?

Accepted Answer

Damage to arterial endothelium, promoting plaque formation

Question 19

Which plasma protein is responsible for escorting lipids in the blood?

Accepted Answer

Apolipoproteins

Question 20

Which of the following best describes the difference between bone marrow stem cells and embryonic stem cells?

Accepted Answer

Bone marrow stem cells are multipotent, while embryonic stem cells are pluripotent.

Blood Components: Structure, Function, and Clinical Relevance

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