When the body is invaded by antigens, the immune system forms substances called :

When the body is invaded by antigens, the immune system forms substances called
 
  A) antibodies.
  B) macrophages.
  C) lymphocytes.
  D) helper cells.

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All of the following behaviors will compromise your immune system's ability to fight infections EXCEPT
 
  A) not getting enough sleep.
  B) eating junk food.
  C) excessive alcohol consumption.
  D) exercising regularly.

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Every time you eat something that contains yellow dye, you wheeze and get a rash. The dye must be an
 
  A) antibody.
  B) antigen.
  C) enzyme.
  D) immunoglobulin.

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You want to decrease your risk of developing an infectious disease. Which of the following factors is within your individual control?
 
  A) heredity
  B) nutritional status
  C) environmental conditions
  D) age

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A substance that triggers an immune response is a(n)
 
  A) pathogen.
  B) antigen.
  C) antibody.
  D) toxin.