Why does the immune system have macrophages,phagocytes,and natural killer cells?

Question

Quizplus · Accepted Answer

The immune system has macrophages, phagocytes, and natural killer cells in order to fight off any foreign substance, including those never before encountered. These cells are part of the innate immune system and provide non-specific defense mechanisms against a wide range of pathogens. They do not create immunological memory for a specific intruder or relay information to the brain about an infection. While they do catch some foreign matter before it penetrates the skin, that is not their primary function.

Why Does the Immune System Have Macrophages,phagocytes,and Natural Killer Cells