In our body, neutrophils, macrophages and lymphocytes are involved in the second line of defence. They produce non-specific immune responses such as fever and inflammatory response. Neutrophils are a type of WBC and they form an essential part of the innate immune system. Neutrophils are one of the first-responders of inflammatory cells to migrate towards the site of inflammation.
Macrophages are the type of WBC which engulfs and digests cellular debris, foreign substances, microbes etc. Lymphocytes are a type of WBC. It includes natural killer cells (which function in cell-mediated, cytotoxic innate immunity), T cells (for cellmediated, cytotoxic adaptive immunity), and B cells (for humoral, antibody-driven adaptive immunity).

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