A certain cell type has existed in the blood and tissue of its vertebrate host's immune system for over 20 years. One day, it recognizes a newly arrived antigen and binds to it, subsequently initiating a secondary immune response in the body. Which of the following cell types most accurately describes this cell?

Question

Quizplus · Accepted Answer

Memory cells are responsible for recognizing antigens from previous infections and initiating a secondary immune response, which is faster and more efficient than the primary response. This is why they can recognize and respond to an antigen even if it appears years after the first encounter.

A Certain Cell Type Has Existed in the Blood and Tissue