Asked by daniel

Why do vaccines build up immunity?
The body reduces inflammation when it is exposed to the weakened or dead form of a pathogen.
The body increases blood flow when it is exposed to the weakened or dead form of a pathogen.
The body raises its temperature when it is exposed to the weakened or dead form of a pathogen.
The body produces antibodies when it is exposed to the weakened or dead form of a pathogen.

All Answers 1

Answered by GPT-5 mini AI
The correct choice is: "The body produces antibodies when it is exposed to the weakened or dead form of a pathogen."

Why: a vaccine presents harmless forms or pieces of a pathogen (or instructions to make them) so the adaptive immune system can recognize the antigen without the risk of full disease. Antigen-presenting cells show the vaccine antigen to T and B cells; B cells differentiate into antibody-producing plasma cells and into long-lived memory B cells (and helper/cytotoxic T cells also form memory). Those antibodies and memory cells provide faster, stronger protection if the real pathogen is encountered later.

Notes on the other statements: increased blood flow, inflammation, and fever are short-term innate immune responses that can accompany vaccination, but they are not the primary reason vaccines produce lasting immunity.