Not sure: I don't think there is a biological purpose to hiccups - it is just a spasm of the diaphragm. As for a yawn, it most often occurs when your sleepy, but I believe it is more related to the nervous system that to the respiratory system.
Answered 5/5/2017
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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