Secondary Immune Responses Upon a Second Exposure to a Pathogen

Question

Secondary immune responses upon a second exposure to a pathogen are due to the activation of
A)memory cells.
B)macrophages.
C)stem cells.
D)B cells.
E)T cells.

Accepted Answer

Memory cells are created during the primary immune response and are able to recognize and quickly respond to a pathogen upon a second exposure. This results in a faster and more efficient secondary immune response. Macrophages, stem cells, B cells, and T cells are all involved in the immune response, but memory cells are specifically responsible for the rapid response in a secondary immune response.