Asked by anonymous

humans have the ability to effectively swallow upside down, what makes this possible?

explain clearly plz!!!
Answered by bobpursley
http://answers.yahoo.com/question/index?qid=20070802162159AA9cCWB

Answered by DrBob222
http://www.madsci.org/posts/archives/2005-03/1110582380.An.r.html
Answered by Ms. Sue
http://hes.ucfsd.org/gclaypo/digestive_system.html#Can we swallow if we are upside

http://www.pennmedicine.org/encyclopedia/em_DisplayAnimation.aspx?gcid=000097&ptid=17
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