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 immune defenses

Question

Quizplus · Accepted Answer

Physical barriers of nonspecific defenses refer to the cells and tissues that form the first line of defense against pathogens. These include the cells that line the body surfaces (such as skin and mucous membranes) and the chemicals they secrete (such as mucus and stomach acid). Phagocytes (Choice B) and interferon (also Choice B) are part of the second line of defense of the immune system, which are still considered nonspecific defenses but do not fall under physical barriers. Antibody production (Choice C) is part of the specific immune response, which is a later defense mechanism that is activated upon the recognition of a specific antigen. Therefore, Choice A is the best answer.

Physical Barriers of Nonspecific Defenses