Question

Larry is taking a walk in the park. The pollen in the air makes him sneeze constantly. What line defenses is his immune system exhibiting?

Answer 1

The line of defense that is his immune system exhibiting is that of "first line of defense." There are only 3 lines of defense in the immune system. The first line of defense are a combination of physical and chemical barriers that prevent all types of foreign agents from penetrating the outer layer of the body. In this case, it is the nasal cavity.

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