Why do you think it is necessary for the stomach to close its openings at both ends during digestion ?

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Solution

It is necessary to close the openings of the stomach to prevent food from entering back to esophagus or small intestine.

At the end of the esophagus, a muscular ring called a sphincter allows food to enter the stomach and then squeezes shut to keep food or fluid from flowing back up into the esophagus.

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