Barriers to Pathogen Invasion Quiz
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Questions and Answers

Which of the following is NOT a way in which normal microbiota contribute to the body's defense?

  • Aiding in digestion and absorption of food
  • Producing toxins that harm the body (correct)
  • Competing for nutrients
  • Altering the pH of the environment
  • Which of the following is a normal resident of the skin?

  • Staphylococcus epidermidis (correct)
  • Salmonella typhimurium
  • Bacillus cereus
  • Escherichia coli
  • What is the main component responsible for destroying most bacteria in gastric juice?

  • Enzymes
  • pH alteration
  • HCl (hydrochloric acid) (correct)
  • Mucus
  • Which type of immunity is present at birth and does not involve specific recognition of microbes?

    <p>Nonspecific defense</p> Signup and view all the answers

    Which type of immunity involves specific cells recognizing foreign substances and reacting by producing specific proteins?

    <p>Specific defense (adaptive)</p> Signup and view all the answers

    Which type of immunity is acquired through receiving antibodies from another source rather than producing them within the body?

    <p>Passive immunity</p> Signup and view all the answers

    Which type of immune cell is responsible for engulfing and destroying pathogens in the body?

    <p>Monocytes</p> Signup and view all the answers

    What is the main component of blood that plays a role in cellular defenses as part of the second line of defense?

    <p>Plasma (liquid)</p> Signup and view all the answers

    Which cells are NOT part of the formed elements in blood?

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

    What type of immunity involves being cured from a disease or receiving a vaccination?

    <p>Active immunity</p> Signup and view all the answers

    Which structure in the respiratory tract helps clear microbes in mucus out of the respiratory tract?

    <p>Ciliary escalator</p> Signup and view all the answers

    Which substance, found in most body secretions, breaks down peptidoglycan cell walls?

    <p>Lysozyme</p> Signup and view all the answers

    Which substance, produced by the lacrimal apparatus, washes microbes off the eye?

    <p>Tears</p> Signup and view all the answers

    Which type of epithelium is less protective than keratinized epithelium?

    <p>Mucous membranes</p> Signup and view all the answers

    Which substance, found in skin, has an acidic pH that inhibits microbe growth?

    <p>Sebum</p> Signup and view all the answers

    Which structure in the respiratory tract is lined with ciliated epithelium and beats in a wave motion to clear microbes in mucus?

    <p>Ciliary escalator</p> Signup and view all the answers

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