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To which type of barriers under innate immunity, do the saliva in the mouth and the tears from the eyes, belong?

1. Cytokine barriers
2. Cellular barriers
3. Physiological barriers
4. Physical barriers

Correct answer: Physiological barriers

Solution

Saliva and tears are secretions that help protect the body by flushing away pathogens and containing antimicrobial factors like lysozyme. These are classified as physiological barriers in innate immunity.

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