Problemsometimes while tasting a very sour thing like, Ask an Expert

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Problem:

Sometimes while tasting a very sour thing (like tamarind, lemon etc.) our eyes squint immediately and involuntarily for a second, but a little later becomes normal again.

Required:

Question: Why, and how, does this reflexive movement occur?

Any help would be greatly appreciated!

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Category:- Biology
Reference No.:- M91162349

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