Question

Assertion: Some disease that attack in childhood do not attack again.
Reason :Memory cells play an important role.

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Answer 1

Explanation:

After the infection disappears as a result of antigen-antibody interaction, some of the specific lymphocytes remain in lymphatic tissue as "memory or primed cells" that give rise to more effector cells and memory cells in case of a second attack of antigens. The effector cells have a life of a few days only,and the memory cells live long, some even for whole life. That is why the second attack of the infectious disease elicit quick response.

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