Why/How does the human body produce tears when seeing something that makes you sad (also happy)?

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Why/How does the human body produce tears when seeing something that makes you sad (also happy)?

In: Biology

Last time I read up on this the answer was “nobody really knows.” Best guess is tears worked as a way to express pain or other strong emotions without potentially giving away our position to predators with vocal signals.

The emotional centers of the brains have a connection to the superior salivatory nucleus, which is the area of the brainstem responsible for tear production. This nucleus outflows as cranial nerve 7 and triggers the lacrimal gland in your eyes to produce tears.

I don’t remember where, but I read that for sadness, tears contain a stress chemical so in theory your body could be ridding if you of it which in turn could level your mood a bit possibly.
Interesting idea, not sure if it’s true though.