Long-term immunity against pathogens is provi | vedclass

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(B) Long-term immunity,also known as immunological memory,is provided by memory cells.When the body is first exposed to a pathogen (primary response),

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Memory cells

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(B) Long-term immunity,also known as immunological memory,is provided by memory cells.When the body is first exposed to a pathogen (primary response),some $B$ and $T$ lymphocytes differentiate into memory cells.These memory cells persist in the body for a long time.Upon subsequent exposure to the same pathogen,these memory cells recognize the antigen rapidly and initiate a secondary immune response,which is much more intense and faster than the primary response.

Long-term immunity against pathogens is provided by which of the following?

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