2. Macrophages

Macrophages play a defensive role in the immune system. These monocytes are responsible for phagocytosis, the process of engulfing and destroying microbes and parasites, though the experts do not completely understand the mechanism they use to kill these invaders. Macrophages also regulate another type of white blood cell — lymphocytes — particularly in response to antigens, to enhance the immune response.

Macrophage Immune Response Marcin Klapczynski / Getty Images
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