Pretty much every other bodily action I can think of is under your control and you can forcefully stop it on command, like yawning. What prevents you from re-opening your throat until after you’ve completed the act of swallowing in its entirety?
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Theres a flap in the throat that prevents liquid and debris from getting into the lungs when you eat and drink. If you could open the throat and breathe mid swallow, you’d probably end up with some type of chronic pneumonia or possibly drown yourself. Its a “safety” of sorts.
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