The skin would be an example of
A) a first line of defense.
B) a second line of defense.
C) a third line of defense.
D) all of these.
E) none of these.

Question

Quizplus · Accepted Answer

The skin is considered the first line of defense in the immune system as it acts as a physical barrier to prevent pathogens from entering the body. The second line of defense includes non-specific immune responses such as inflammation and the actions of white blood cells, while the third line of defense involves specific immune responses by B and T cells.

The Skin Would Be an Example of