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The ____________ acts as the first sphincter of the digestive tract by voluntarily controlling entrance into the ____________ .
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The ____________ acts as the first sphincter of the digestive tract by voluntarily controlling entrance into the ____________ .

User Moshe Sommers
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Answer:

The orbicularis oris acts as the first sphincter of the digestive tract by voluntarily controlling entrance into the buccal cavity.

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User Just Lucky Really
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