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19. Innate Immunity - Part 1 of 3

19. Innate Immunity / Introduction to First-Line Defenses / Problem 3

Which of the following options correctly includes only components of the first line of defense?

A

Skin, cilia, saliva enzymes, gastric acid, sweat glands, and hair follicles

B

Macrophages, mast cells, natural killer cells, and complement system

C

Antibodies and memory cells, and specific immune responses

D

Skin, cilia, saliva enzymes, macrophages, mast cells, and natural killer cells

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