The first line of defense to protect the body against foreign invaders is
A)physical barriers.
B)cellular components.
C)white blood cells.
D)natural killer cells.

Name: The first line of defense to protect the body against foreign invaders is A)physical barriers. B)cellular components. C)white blood cells. D)natural killer cells.
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Question

Quizplus · Accepted Answer

Physical barriers such as skin, mucous membranes, and hair act as the first line of defense by preventing foreign invaders from entering the body in the first place.

The First Line of Defense to Protect the Body Against