Question:

WHY DO TEARS FALL DOWN WHEN A FOREIGN PARTICLE GETS INTO OUR EYES?

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WHY DO TEARS FALL DOWN WHEN A FOREIGN PARTICLE GETS INTO OUR EYES?

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  1. tear secretion is a defense mechanism for eyes lacrymal gland secrete tear when any dust or any other irritating element entered into eyes


  2. self regulatory mechanism-----to flush out foreign particle.
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