Physical barriers of nonspecific defenses
A) include both the cells that line the body surfaces and the chemicals they secrete
B) include phagocytes and interferon
C) respond to antigens by making thousands of different antibodies
D) are part of the host cellular defenses

Question

Quizplus · Accepted Answer

Physical barriers are the first line of defense in our nonspecific defenses. They include the cells that line the body surfaces such as skin, respiratory, digestive, and genitourinary tracts along with the chemicals they secrete like sweat, oil, mucus, and stomach acid. These barriers prevent the entry of pathogens into the body.

Physical Barriers of Nonspecific Defenses