A man opens up an old loaf of bread and inhales Penicillium spores from the organism growing inside. Inside the man's lungs, phagocytes engulf and digest the spores. The man never gets sick. This is an example of

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Innate immunity refers to the non-specific defense mechanisms that come into action immediately or within hours of an antigen's appearance in the body. These mechanisms include physical barriers such as skin, chemicals in the blood, and immune system cells that attack foreign cells in the body. The scenario described involves phagocytes, a type of cell involved in innate immunity, which engulf and digest foreign invaders such as the Penicillium spores without the need for prior exposure or the development of a specific immune response.

A Man Opens Up an Old Loaf of Bread and Inhales