Which of the following is a characteristic of the third line of defense that makes it significantly different from the second line?
A) The response is specific to a single antigen.
B) The initial response is very rapid, beginning in minutes to a couple of hours.
C) The response is effective on a broad range of antigens.
D) The response to a second exposure is similar to the response to a first exposure.
E) The responding cells are a variety of cell types.

Question

Quizplus · Accepted Answer

The third line of defense, also known as the adaptive immune response, is characterized by its specificity to a single antigen. This means that the immune system can distinguish between different types of antigens and mount a targeted response to the specific antigen that is encountered. In contrast, the second line of defense, or innate immune response, is a more general response that can recognize a broad range of pathogens but does not specifically target individual antigens.

Which of the Following Is a Characteristic of the Third