HNR 2102 Week 9: Host Defenses and Immune System
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Questions and Answers

What is the purpose of the first line of defense?

  • To provide a specific response to infection
  • To block invasion at the portal of entry (correct)
  • To produce protective antibodies
  • To create memory cells

What type of resistance does the innate defense provide?

  • Acquired
  • Nonspecific (correct)
  • Specific
  • Adaptive

What occurs if infectious agents make it past the surface defenses?

  • The adaptive immune system is triggered
  • The second line of defense is activated (correct)
  • The immune system surrenders
  • The inflammatory response is suppressed

What is an example of a chemical barrier in the first line of defense?

<p>Acidic pH of the skin (C)</p> Signup and view all the answers

What is a characteristic of acquired immunity?

<p>It must be acquired (D)</p> Signup and view all the answers

What is the role of memory cells in the immune system?

<p>To establish a specific immune response (B)</p> Signup and view all the answers

What is the main function of the skin and mucous membranes in the first line of defense?

<p>To prevent the entry of pathogens (B)</p> Signup and view all the answers

What is the role of stomach acid in the body's defense?

<p>To kill pathogens (D)</p> Signup and view all the answers

What is the function of lysozyme?

<p>To hydrolyze the cell wall of bacteria (C)</p> Signup and view all the answers

What is the term for the study of the body's second and third lines of defense?

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

What is the role of the third line of defense?

<p>To recognize specific pathogens (C)</p> Signup and view all the answers

What is the function of sebaceous glands in the body's defense?

<p>To produce fatty acids (D)</p> Signup and view all the answers

What is the primary function of Toll-like receptors in macrophages?

<p>To recognize foreign molecules and stimulate an immune response (D)</p> Signup and view all the answers

What is the result of increased blood flow in injured tissues during the inflammatory response?

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

What is the purpose of the complement system in the immune response?

<p>To facilitate phagocytosis and eliminate pathogens (C)</p> Signup and view all the answers

What is the primary goal of the immune response during inflammation?

<p>To contain and eliminate the infection (A)</p> Signup and view all the answers

What is the result of increased fluid escape into the tissue during the inflammatory response?

<p>Edema and pus formation (A)</p> Signup and view all the answers

What is the function of endogenous pyrogens?

<p>To liberate products of infectious agents (D)</p> Signup and view all the answers

What is the benefit of fever in relation to microorganisms?

<p>It inhibits the multiplication of temperature-sensitive microorganisms (D)</p> Signup and view all the answers

What is the role of eosinophils in the body?

<p>To be attracted to sites of parasitic infections and antigen-antibody reactions (D)</p> Signup and view all the answers

What do phagocytes do to foreign matter?

<p>They ingest and eliminate the foreign matter (A)</p> Signup and view all the answers

What is the role of macrophages in the body?

<p>To scavenge and process foreign substances to prepare them for reactions with B and T lymphocytes (C)</p> Signup and view all the answers

What is the function of inflammatory response?

<p>To initiate a immune response (B)</p> Signup and view all the answers

What is the process by which bacterial cells are engulfed into a phagocytic vacuole?

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

What is the term for bacterial cells that can induce an immune response in the host?

<p>Immunogens (C)</p> Signup and view all the answers

What is the result of the fusion of a phagosome with a lysosome?

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

What is the role of reactive oxygen products in the killing and destruction of bacterial cells?

<p>They help to destroy bacterial cells (C)</p> Signup and view all the answers

What is the term for the molecules that react with antibodies or T cells?

<p>Antigens (C)</p> Signup and view all the answers

What is the result of the action of enzymes such as lysozyme, DNase, and RNase?

<p>Breakdown of bacterial cell components (B)</p> Signup and view all the answers

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