The purpose of a booster shot is to
a. elicit a primary response to an antigen.
b. elicit a secondary response to an antigen.
c. re-establish the formation of antibodies.
d. counteract specific antigens in the system.
e. seek out invaders.
B
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Dr. Singh just returned from a year working in rural Africa for the World Health Organization, and now he has a small clinic in San Francisco. In both locations, he sometimes sees patients with chronic elevated IgE levels. Match the doctor's initial diagnosis for a patient in each location.
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According to the above figure, which letter corresponds to the area where water is absolutely not reabsorbed?
A. A B. B C. C D. D E. E