body's first, non-specific defense against pathogens
Innate immunity, also known as natural or non-specific immunity, is the body's first line of defense against pathogens. It includes physical barriers like skin and mucous membranes, as well as immune cells like macrophages and neutrophils that can quickly respond to a wide range of invaders without prior exposure. This system provides immediate, but generalized, protection and does not adapt or improve with repeated exposure to the same pathogen.
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