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Which one of the following acts as a physiological barrier to the entry of microorganisms in human body?

1. Epithelium of urogenital tract
2. Tears
3. Monocytes
4. Skin

Correct answer: Tears

Solution

Tears act as a physiological barrier because they continuously flush the eye surface and contain lysozyme, which can damage bacterial cell walls. This makes them an important first-line defense against microbial entry.

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