AP BIOLOGY

Detailed explanation-1: -This kind of cells is called memory T cells. Because memory T cells have been trained to recognize specific antigens, they will trigger a faster and stronger immune response after encountering the same antigen. This is how vaccines work to protect us against infection.

Detailed explanation-2: -The human body is separated from the outside world by barrier surfaces that carry out many functions to promote human health. Memory T cells reside in these tissues, which consist mainly of the intestine, lungs, skin and genital surfaces.

Detailed explanation-3: -In the primary response to infection, antibodies are secreted first from plasma cells. Upon re-exposure to the same pathogen, memory cells differentiate into antibody-secreting plasma cells that output a greater amount of antibody for a longer period of time.

Detailed explanation-4: -Immunological memory is a unique property of the immune system as it can “store” information about a stimulus and can mount an effective response when the stimulus is encountered again. This response – a secondary immune response – is quicker and stronger than the primary response.