What purpose does that little knob of skin on the upper mouth behind the front teeth serve?

Question

What purpose does that little knob of skin on the upper mouth behind the front teeth serve?

In: Biology

Answer 1

It closes off the sinus cavity when you swallow food.

There’s another flap further down that closes off the lung entrance too, so that the system is fully sealed while you’re swallowing – wouldn’t want food or liquid to enter the breathing system.