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BIO 140 Human Biology I - Questions and Solutions

Barrier Defenses and the Innate Immune Response - Solutions

Review Questions

1. Which of the following signs is not characteristic of inflammation?

  1. redness
  2. pain
  3. cold
  4. swelling

2. Which of the following is not important in the antiviral innate immune response?

  1. interferons
  2. natural killer cells
  3. complement
  4. microphages

3. Enhanced phagocytosis of a cell by the binding of a specific protein is called ________.

  1. endocytosis
  2. opsonization
  3. anaphylaxis
  4. complement activation

4. Which of the following leads to the redness of inflammation?

  1. increased vascular permeability
  2. anaphylactic shock
  3. increased blood flow
  4. complement activation


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Critical Thinking Questions

1. Describe the process of inflammation in an area that has been traumatized, but not infected.

Solution: The cell debris and damaged cells induce macrophages to begin to clean them up. Macrophages release cytokines that attract neutrophils, followed by more macrophages. Other mediators released by mast cells increase blood flow to the area and also vascular permeability, allowing the recruited cells to get from the blood to the site of infection, where they can phagocytose the dead cells and debris, preparing the site for wound repair.

2. Describe two early induced responses and what pathogens they affect.

Solution: Interferons are produced in virally infected cells and cause them to secrete signals for surrounding cells to make antiviral proteins. C-reactive protein is induced to be made by the liver and will opsonize certain species of bacteria.


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OpenStax, Barrier Defenses and the Innate Immune Response. OpenStax CNX. Jun 19, 2013 © Jun 19, 2013 OpenStax. Textbook content produced by OpenStax is licensed under a Creative Commons Attribution License 3.0 license.