Question 1

Which of the following best describes the primary function of the skin as a line of defense in the human body?

Accepted Answer

It acts as a physical barrier preventing pathogen entry.

Question 2

Which chemical property of lysozyme allows it to protect against bacterial infection?

Accepted Answer

Lysozyme hydrolyzes the $$	ext{N-acetylmuramic acid} in $$bacterial cell walls.

Question 3

A patient with a genetic deficiency in complement proteins is most likely to experience which of the following?

Accepted Answer

Increased susceptibility to bacterial infections due to impaired opsonization.

Question 4

Which of the following best explains why fever can be beneficial during an infection?

Accepted Answer

Fever inhibits the growth of some pathogens and enhances immune cell activity.

Question 5

Which of the following is NOT a function of inflammation?

Accepted Answer

Suppression of immune cell activity.

Question 6

Which of the following best describes the process of phagocytosis?

Accepted Answer

The engulfment and digestion of pathogens by immune cells.

Question 7

A patient is exposed to a bacterial pathogen. Which innate immune response is most likely to occur first?

Accepted Answer

Phagocytosis by neutrophils and macrophages.

Question 8

Which of the following is a direct effect of complement activation?

Accepted Answer

Formation of the membrane attack complex (MAC) leading to cell lysis.

Question 9

Which of the following antimicrobial substances is found in tears and saliva and is effective against Gram-positive bacteria?

Accepted Answer

Lysozyme

Question 10

Which of the following best describes the role of normal microbiota in the human body’s defense?

Accepted Answer

They compete with pathogens for nutrients and space, limiting pathogen growth.

Question 11

Which of the following is a chemical barrier that protects the body from infection?

Accepted Answer

Low pH of stomach acid

Question 12

A patient with a burn injury loses the integrity of their skin. Which line of defense is most compromised?

Accepted Answer

First line of defense (physical barrier)

Question 13

Which of the following is an example of a mechanical barrier to infection?

Accepted Answer

Ciliary movement in the respiratory tract

Question 14

Which of the following best explains the role of interferons in viral infections?

Accepted Answer

Interferons signal neighboring cells to produce antiviral proteins.

Question 15

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

Accepted Answer

Vasodilation, increased permeability, migration of phagocytes, tissue repair

Question 16

Which of the following best describes the process of opsonization?

Accepted Answer

Coating of pathogens with molecules that enhance phagocytosis

Question 17

A patient is given a drug that inhibits neutrophil migration. Which immune process will be most affected?

Accepted Answer

Phagocytosis of pathogens at the site of infection

Question 18

Which of the following is a function of antimicrobial peptides?

Accepted Answer

Disrupting microbial membranes leading to cell death

Question 19

Which of the following is a real-life example of the importance of the first line of defense?

Accepted Answer

Individuals with cystic fibrosis have thick mucus that impairs ciliary movement, increasing susceptibility to respiratory infections.

Question 20

Which of the following equations best represents the relationship between the rate of phagocytosis ($$R) $$and the concentration of opsonins ($$C$$)?

Accepted Answer

$$R = kC$$

Chapter 15 study guide

스터디 가이드 - 연습 문제