The esophagus, a tube that carries food to the stomach, is constantly being scraped as food travels through it. Why does the esophagus not deteriorate through a person’s lifetime?

The esophagus’s inner lining is exposed to friction as food passes through, so worn or damaged cells need to be replaced. Cells in the lining continually divide to make new cells, maintaining the tissue over time. Therefore, the correct choice is “Cells are constantly dividing and replacing old or damaged cells.”

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