HISTOLOGY
DIGESTIVE SYSTEM
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Question
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Chewing involves voluntary muscles-these are ones that we consciously control-but once we swallow, digestion becomes involuntary.Which sentence from the section provides further support for the claim?
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Our teeth start the process by chewing and grinding up each mouthful of food.
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The tongue works it into a ball-shaped mass, or bolus, for swallowing.
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Saliva uses specialized proteins called enzymes.
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It is sealed in the stomach by two ringlike sphincter muscles for several hours.
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Explanation:
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