The formation of memory immune responses is the objective of vaccination. Immunological memory is predominantly the function of which of the following?

The formation of memory immune responses, which is the objective of vaccination, is predominantly the function of B and T lymphocytes. These cells are part of the adaptive immune system and have the ability to "remember" pathogens, allowing the immune system to respond more quickly and effectively to subsequent exposures.

Here's a step-by-step breakdown:

1. When a pathogen enters the body for the first time, it is recognized as foreign by the immune system. This triggers an immune response, which includes the activation of B and T lymphocytes.

2. B lymphocytes produce antibodies that can bind to the pathogen and neutralize it. T lymphocytes can directly kill infected cells.

3. Some of these activated B and T cells will become memory cells. These cells remain in the body long after the initial infection has been cleared.

4. If the same pathogen enters the body again, these memory cells are able to recognize it and mount a faster and stronger immune response. This is why vaccinations, which expose the body to a harmless form of a pathogen, can protect against future infections.

5. Therefore, the formation of memory immune responses, the objective of vaccination, is predominantly the function of B and T lymphocytes.