Human Digestive System

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The Esophagus connects the throat above with the stomach below. At the junction of the esophagus and stomach, there is a ring like valve closing the passage between the two organs. However, as the food approaches the closed ring, the surrounding muscles relax and allow the food to pass...
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We can also swallow the food upside down because the muscles around the esophagus are strong enough to push the food up to our stomach. The food then enters the stomach, a sack that receives the food from the esophagus. The stomach is located just below the heart...
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