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What is peristalsis and why is it useful...

What is peristalsis and why is it useful?

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**Step-by-Step Solution:** 1. **Definition of Peristalsis**: Peristalsis is a type of involuntary movement that occurs in the digestive tract. It involves the contraction and relaxation of muscles in a wave-like manner. 2. **Mechanism of Peristalsis**: When food enters the esophagus, the muscles contract behind the food bolus (the mass of food) and relax in front of it. This creates a wave-like motion that pushes the food down towards the stomach. ...
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