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Animation: The Immune Response
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View the animation below, then complete the quiz to test your knowledge of the concept.






1Foreign substances that elicit an immune response are termed
A)aliens.
B)antigens.
C)antibodies.
D)viruses.
E)bacteria.



2Macrophages secrete ________ which then activates ________ .
A)antibodies ; helper T cells
B)interleukin-1 ; cytotoxic T cells
C)interleukin-1 ; helper T cells
D)interleukin-2 ; cytotoxic T cells
E)interleukin-2 ; helper T cells



3The human body makes
A)only one type of cytotoxic T cell.
B)tens of different types of cytotoxic T cells.
C)hundreds of different types of cytotoxic T cells.
D)thousands of different types of cytotoxic T cells.
E)millions of different types of cytotoxic T cells.



4Helper T cells can stimulate the proliferation of cytotoxic T cells but not that of B cells.
A)True
B)False



5The secondary immune response to a previously encountered pathogen is swifter and stronger than the primary immune response.
A)True
B)False







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