Question

The second phase of the body's immune response to a foreign substance involves ________ of/by the body's defenses.

Answer 1

The answer is; activation

The second phase of defense is called the adaptive immune response. It involved the recruitment of white blood cells (leucocytes) (mainly the B- and T- cells). The innate defense system, which is the first response to an invading pathogen, involves the body’s physical barriers such as the skin and mucous membrane.