The first line of defense against antigen is the _________ system.
A. respiratory
B. digestive
C. integumentary
D. lymphatic
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The graph shows the antibody levels in the blood after a person has been exposed twice to the same pathogen. With regard to this pathogen we can conclude that
A. the person has a deficient immune response.
B. the virulence of the pathogen increased between the first and second exposures.
C. antibodies are only produced after a second exposure to the pathogen.
D. memory cells for antibodies against the pathogen exist at the time of the second exposure.
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