Final answer:
The three lines of defense according to IIA are: the first line of defense-physical and chemical barriers, the second line of defense-inflammatory response, and the third line of defense-adaptive immune system.
Step-by-step explanation:
The three lines of defense according to IIA are:
- The first line of defense includes physical and chemical barriers that prevent pathogens from entering the body. Examples include the skin, mucous membranes, and stomach acid.
- The second line of defense activates when the first line is breached. It includes inflammatory response and immune cells like macrophages and neutrophils.
- The third line of defense is the adaptive immune system, which produces antibodies and T cells to specifically target and eliminate pathogens.