If pathogens evade the non-defenses of the upper respiratory tract and enter the alveoli,_______ can protect the body from infection.

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Macrophages are specialized cells that play a crucial role in the body's immune defense against pathogens. They are found in tissues throughout the body, including the lungs, where they are called alveolar macrophages. When pathogens evade the non-defenses of the upper respiratory tract and enter the alveoli, alveolar macrophages can engulf and destroy them, thus protecting the body from infection. Histiocytes are a type of macrophage that is found in tissues such as the skin and connective tissue, but not the lungs. NK cells are a type of white blood cell that play a role in innate immunity but are not specific to respiratory infections. Goblet cells are specialized cells that secrete mucus and do not play a direct role in immune defense.

If Pathogens Evade the Non-Defenses of the Upper Respiratory Tract