Q: Which of the following is the correct formula for the conversion of fibrinogen to fibrin in the coagulation cascade?

$$\text{Fibrinogen} \xrightarrow{\text{Thrombin}} \text{Fibrin}$$

Question 1

Which of the following is NOT a main function of the immune system?

Accepted Answer

Regulation of blood pressure

Question 2

A patient develops an autoimmune disease due to the immune system failing to distinguish self from non-self. Which of the following is an example of such a disease?

Accepted Answer

Type 1 diabetes

Question 3

Which of the following best describes the role of macrophages in the immune system?

Accepted Answer

They patrol the extracellular compartment and remove dead or dying cells via phagocytosis

Question 4

Which of the following is a physical barrier that helps prevent pathogens from entering the body?

Accepted Answer

Skin

Question 5

What is the correct sequence of events when the body encounters a pathogen?

Accepted Answer

Innate immune cells recognize pathogens, inflammatory response is triggered, neutrophils and macrophages arrive, dendritic cells present antigens to T-cells

Question 6

Which of the following molecules is responsible for presenting antigens to T cells?

Accepted Answer

Major Histocompatibility Complex (MHC)

Question 7

Which of the following is a hallmark sign of inflammation?

Accepted Answer

Rubor (redness)

Question 8

Which pathway is responsible for the activation of the coagulation cascade following cell injury?

Accepted Answer

Extrinsic pathway

Question 9

What is the role of opsonins in the immune response?

Accepted Answer

They bind to foreign microorganisms or cells, making them more susceptible to phagocytosis

Question 10

Which of the following statements about platelets is TRUE?

Accepted Answer

Platelets are cell fragments derived from megakaryocytes

Question 11

A patient with hemophilia is likely to have a defect in which process?

Accepted Answer

Coagulation cascade

Question 12

Which of the following is a chemical barrier that helps protect against pathogens?

Accepted Answer

Lysozyme

Question 13

Which immune cells are primarily responsible for bridging innate and adaptive immune responses?

Accepted Answer

Antigen-presenting cells (APCs)

Question 14

Which signaling molecules are essential for communication between immune cells during an immune response?

Accepted Answer

Cytokines and antibodies

Question 15

Which of the following best describes the difference between the intrinsic and extrinsic pathways of coagulation?

Accepted Answer

Intrinsic pathway is known as the contact activation pathway, while extrinsic pathway is known as the cell injury pathway

Question 16

Which of the following is the correct formula for the conversion of fibrinogen to fibrin in the coagulation cascade?

Accepted Answer

$$	ext{Fibrinogen} \xrightarrow{	ext{Thrombin}} 	ext{Fibrin}$$

Question 17

Which of the following is an endogenous anticoagulant that helps limit the extent of clotting?

Accepted Answer

Heparin

Question 18

Which of the following best describes the role of lymph nodes in physiology?

Accepted Answer

They are sites for immune defense, fluid balance, and waste removal

Question 19

Which of the following is a correct description of the exogenous pathway of antigen presentation?

Accepted Answer

Extracellular antigens are engulfed by APCs and presented on MHC class II molecules

Question 20

Which of the following is a plausible consequence of a lack of response by the immune system?

Accepted Answer

Immunodeficiency diseases such as AIDS

Immune System Physiology: Structure, Function, and Pathology

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