which-of-the-following-options-correctly-includes-only-components-of-the-first-l

Question

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

Accepted Answer

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

Answer

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

Answer

Antibodies and memory cells, and specific immune responses

Answer

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