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Upper esophageal sphincter: Quiz

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Question 1: This article was originally based on an entry from a ________ edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.
CopyrightCopyright infringementIntellectual propertyPublic domain

Question 2: Unlike the lower esophageal sphincter, it consists of striated muscle and is under ________ control.
IdeaGottfried LeibnizHenri BergsonConsciousness







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