3
QuizMultiple Choice

The Immune System

Question 3 • Science 7 B (M12 25/26 S2)

James was exposed to a pathogen when he was 10 years old and felt ill.What would most likely happen if he were exposed to the same pathogen when he is 12 years old?

Answer
A
His body would destroy the pathogen before he felt symptoms.
B
His reaction to the pathogen would be worse than the first.
C
His antibodies would decrease, since he had been exposed already.
D
New types of antibodies would be made in response to the second exposure.

Explanation

After the first exposure, James’s immune system formed memory cells that recognize the pathogen. If he encounters the same pathogen again, these cells can trigger a faster, stronger immune response, often destroying it before symptoms develop. The second exposure does not typically make the illness worse or cause antibodies to decrease.

AI-written and checked against the verified answer.

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