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(A) Active acquired immunity is developed when the immune system encounters an antigen and produces a specific response. This process involves the act

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Memory cells

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(A) Active acquired immunity is developed when the immune system encounters an antigen and produces a specific response. This process involves the activation of $B$-lymphocytes and $T$-lymphocytes. Upon the first exposure to an antigen,the immune system generates memory cells. These memory cells are responsible for recognizing the same pathogen upon subsequent exposure,leading to a faster and more intense secondary immune response. Therefore,memory cells are the key components responsible for the long-term protection associated with active acquired immunity.

Which cells are responsible for active acquired immunity?

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