Quiz: Nonspecific Defenses

1. Interferons are substances released by some cells to fight __________.
a. bacteria
b. viruses
c. symbiotic pathogens
2. Vasodilatation is part of the second line of defense because it results in greater flow of WBCs to the infected site. What chemical causes the vessels to dilate?
a. histamine
b. prostaglandin
c. complement proteins
3. The inflammatory response is part of the __________.
a. specific defense
b. nonspecific defense
c. nonspecific barrier
4. The molecules that help to attract phagocytes to foreign cells are called __________.
a. interferons
b. complement proteins
c. major histocompatibility complex
5. When a virus infects cells, some cells have the ability to release __________, which are chemicals that activate other cells to defend themselves against the virus.
a. interferons
b. complement proteins
c. major histocompatibility complex
6. The inflammatory response is a normal response to tissue damage or the presence of foreign invaders. Which of the following is the correct sequence of events leading up to inflammation?
a. cells release histamine, vasodilation and permeability occurs, phagocytes arrive at the site and begin to engulf the foreign invader
b. blood vessels will dilate and permeability occurs, cells release histamine, which attract phagocytes to the site and begin to engulf the foreign invader
c. cells release histamine, phagocytes are attracted to the site, vasodilation and permeability occurs, which allow the phagocytes to engulf the foreign invader
7. A fever is considered to be a __________ defense.
a. specific
b. nonspecific
c. nonspecific barrier

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