Question 1

Which of the following best describes the difference between innate (non-specific) and adaptive (specific) immune defenses?

Accepted Answer

Innate defenses provide a rapid, general response to pathogens, while adaptive defenses target specific foreign substances and require more time to respond.

Question 2

Which of the following is NOT considered a physical barrier in the body's first line of defense?

Accepted Answer

Stomach acid

Question 3

A patient has a genetic defect that prevents the production of lysozyme in their saliva and tears. Which consequence is most likely?

Accepted Answer

Increased susceptibility to bacterial infections on mucosal surfaces

Question 4

Which cell type is responsible for engulfing and digesting pathogens through the process of phagocytosis?

Accepted Answer

Macrophages

Question 5

Natural killer (NK) cells differ from cytotoxic T cells in which of the following ways?

Accepted Answer

NK cells can attack cells lacking 'self' markers without prior sensitization, while cytotoxic T cells require antigen presentation.

Question 6

During inflammation, which chemical is primarily responsible for increasing the permeability of capillaries, allowing fluid and immune cells to enter the tissue?

Accepted Answer

Histamine

Question 7

A patient develops a fever in response to a bacterial infection. Which of the following best explains the physiological benefit of fever?

Accepted Answer

Fever speeds up the metabolic rate and enhances immune cell activity.

Question 8

Which of the following equations correctly represents the process of phagocytosis as described in the immune response?

Accepted Answer

$$\mathrm{Phagocyte} + \mathrm{Pathogen} \rightarrow \mathrm{Phagosome}$$

Question 9

Which of the following is a function of complement proteins in the immune system?

Accepted Answer

Enhancing phagocytosis and promoting cell lysis of pathogens

Question 10

A person receives antibodies from their mother through breast milk. This is an example of which type of immunity?

Accepted Answer

Passive, naturally acquired immunity

Question 11

Which of the following best describes the role of antigen-presenting cells (APCs) in the adaptive immune response?

Accepted Answer

APCs engulf pathogens, process them, and display fragments on their surface to activate T cells.

Question 12

Which of the following is TRUE regarding immunological memory?

Accepted Answer

Memory cells allow for a faster and stronger response upon re-exposure to the same antigen.

Question 13

Which equation best represents the formation of an immune complex during the humoral response?

Accepted Answer

$$\mathrm{Antigen} + \mathrm{Antibody} \rightarrow \mathrm{Immune~Complex}$$

Question 14

Which of the following best explains why interferons are considered part of the non-specific defense system?

Accepted Answer

Interferons can protect neighboring cells from a variety of viruses, not just one specific type.

Question 15

A patient is exposed to a pathogen for the first time. Which process will occur to generate a population of cells capable of producing antibodies specific to this pathogen?

Accepted Answer

Clonal selection of B cells

Question 16

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

Accepted Answer

Vasodilation, increased capillary permeability, migration of leukocytes, removal of debris

Question 17

Which of the following best describes the role of Toll-like receptors (TLRs) on macrophages?

Accepted Answer

TLRs allow macrophages to recognize and respond to specific pathogens by triggering the release of cytokines.

Question 18

Which of the following equations represents the process of complement activation leading to cell lysis?

Accepted Answer

$$\mathrm{Complement~Protein} + \mathrm{Pathogen~Membrane} \rightarrow \mathrm{Cell~Lysis}$$

Question 19

Which of the following is a characteristic of cell-mediated immunity?

Accepted Answer

It involves T lymphocytes attacking infected or abnormal cells directly.

Innate and Adaptive Immune Defenses: Anatomy & Physiology Study Notes

Guida di studio - Domande di pratica

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