Question 1

Which of the following best describes the primary function of the lymphatic system in immunity?

Accepted Answer

It stores and filters lymphocytes and other white blood cells to help fight infections.

Question 2

Which of the following is an example of a non-specific (innate) defense mechanism?

Accepted Answer

Skin acting as a physical barrier to pathogens

Question 3

A patient receives an injection of antibodies against rabies after being bitten by a potentially rabid animal. This is an example of:

Accepted Answer

Passive immunity

Question 4

Which of the following best explains why organ transplants are sometimes rejected by the recipient's immune system?

Accepted Answer

The recipient's immune system recognizes foreign glycoproteins on the transplanted organ as antigens.

Question 5

Which of the following is NOT a way that antibodies help eliminate antigens?

Accepted Answer

Directly lysing infected cells using perforin

Question 6

Which cell type is primarily responsible for the cell-mediated immune response?

Accepted Answer

Cytotoxic T cells

Question 7

A person who recovers from chickenpox is less likely to get it again due to:

Accepted Answer

The presence of memory B and T cells from the primary immune response

Question 8

Which of the following best describes the role of perforin in the immune response?

Accepted Answer

It creates pores in infected cell membranes, leading to cell death.

Question 9

Which of the following is a characteristic of autoimmune diseases?

Accepted Answer

The immune system attacks the body’s own cells.

Question 10

Which of the following best explains why allergies occur?

Accepted Answer

The immune system overreacts to harmless substances, releasing histamines.

Question 11

Which of the following is a correct sequence of events in the inflammatory response?

Accepted Answer

Histamines are released, capillaries dilate, phagocytes migrate to the site, pathogens are engulfed.

Question 12

Which of the following best describes the difference between humoral and cell-mediated immunity?

Accepted Answer

Humoral immunity involves B cells and antibodies, while cell-mediated immunity involves T cells attacking infected cells.

Question 13

Which of the following is an example of active immunity?

Accepted Answer

Receiving a vaccine that stimulates antibody production

Question 14

Which of the following best explains the role of macrophages in the immune response?

Accepted Answer

They engulf and digest pathogens and present antigens to helper T cells.

Question 15

Which of the following is a function of lymph nodes?

Accepted Answer

They filter lymph and store lymphocytes.

Question 16

Which of the following best describes the process of clonal selection?

Accepted Answer

A single B or T cell is activated by an antigen and divides to produce identical cells specific to that antigen.

Question 17

Which of the following is a likely consequence of an immunodeficiency disease?

Accepted Answer

The immune system is unable to mount an effective response to infections.

Question 18

Which of the following best describes the role of interferons in non-specific defense?

Accepted Answer

They are proteins released by virus-infected cells to help protect neighboring cells from viral infection.

Question 19

Which of the following best explains why vaccination is effective in preventing infectious diseases?

Accepted Answer

It introduces a harmless form of the antigen, stimulating the production of memory cells for a faster secondary response.

Question 20

Which of the following is a correct description of an antigen-antibody complex?

Accepted Answer

A complex that marks foreign cells for destruction by phagocytes.

Immunology: The Lymphatic System and Immune Defense Mechanisms

Study Guide - Practice Questions