Anatomical Barriers and Innate Immunity
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Questions and Answers

What is the primary function of anatomical barriers in the body?

  • To produce antibodies against pathogens
  • To recognize and respond to specific pathogens
  • To prevent the entry of microorganisms into the body (correct)
  • To coordinate the immune response

Which of the following physiological barriers provides immunity by maintaining a high body temperature?

  • Birds (correct)
  • Humans
  • Infants
  • All of the above

What is the function of lysozyme in the body?

  • To cleave bacterial cell walls (correct)
  • To produce antibodies against pathogens
  • To recognize and respond to specific pathogens
  • To coordinate the immune response

Which of the following is an example of a chemical barrier in the body?

<p>Lysozyme (A)</p> Signup and view all the answers

What is the function of acidity in the stomach?

<p>To kill most ingested bacteria (A)</p> Signup and view all the answers

What is the function of nasal hair in the body?

<p>To filter out microbes from dust in the nose (C)</p> Signup and view all the answers

What is the function of histamine in the inflammatory response?

<p>Increases the permeability of blood capillaries (B)</p> Signup and view all the answers

Which type of cell is responsible for recognizing and ingesting foreign substances?

<p>Macrophages (D)</p> Signup and view all the answers

What is the mechanism by which phagocytic cells migrate towards microorganisms?

<p>Chemotaxis (D)</p> Signup and view all the answers

What is the fate of the microorganism after being ingested by a phagocytic cell?

<p>It is digested by hydrolytic enzymes (B)</p> Signup and view all the answers

What is the function of complement proteins in the immune response?

<p>They lyse bacteria, viruses, protozoa, and fungi (A)</p> Signup and view all the answers

What is the outcome of the fusion of phagosome and lysosome?

<p>The formation of phagolysosome and digestion of the microorganism (C)</p> Signup and view all the answers

What is the ability to discriminate among different molecular entities and respond only to those uniquely required responses?

<p>Specificity (B)</p> Signup and view all the answers

Which cells are responsible for processing and presenting antigen to T-cells?

<p>Macrophages and dendritic cells (C)</p> Signup and view all the answers

What is the term for the ability to recognize and respond to molecules that are foreign (non-self) and avoid making a response to those molecules that are self?

<p>Discrimination (A)</p> Signup and view all the answers

Where do T-cell precursors undergo critical maturation steps?

<p>Thymus (B)</p> Signup and view all the answers

What is the property shared with the nervous system that allows the immune system to recall previous contact with a foreign molecule?

<p>Memory (D)</p> Signup and view all the answers

What is the result of antigen-presenting cells processing protein antigens intracellularly?

<p>A constellation of peptides that noncovalently bind to MHC molecules (A)</p> Signup and view all the answers

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