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 recognises a newly arrived antigen and binds to it, subsequently triggering a secondary immune response in the body. Which of the following cell types most accurately describes this cell?
A) plasma cell
B) thyroid cell
C) memory cell
D) macrophage

Question

Quizplus · Accepted Answer

Memory cells are a specialized type of B and T lymphocytes that provide the immune system with long-lasting protection against previously encountered antigens. They are capable of living for years or even decades in the body and can quickly recognize and mount a response against the same antigen if it is encountered again. Therefore, a memory cell that has been in the body for over 20 years and triggers a secondary immune response upon recognizing a newly arrived antigen fits the given scenario. Plasma cells produce antibodies, thyroid cells produce hormones, and macrophages are involved in phagocytosis and antigen presentation, but none of these cell types have the specific characteristics described in the scenario.

A Certain Cell Type Has Existed in the Blood and Tissue