What happens when you swallow something down the 'wrong pipe'

You've probably experienced it before - the unpleasant choking sensation that occurs when you swallow something down the "wrong pipe." Why does this happen, and is there really a "wrong pipe" at all.

There is indeed, and there's a scientific term for it: aspiration. When you swallow something down the "wrong pipe," your body goes into alarm-mode to clear it out as soon as possible.

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