Heartburn is usually caused by the

Question

Quizplus · Accepted Answer

Heartburn is caused by the backflow of chyme (partially digested food) from the stomach into the lower esophagus. The stomach's lining secretes hydrochloric acid to aid in the breakdown of food, which can also contribute to heartburn if it refluxes into the lower esophagus. However, this is not the primary cause of heartburn. Spicy food can irritate the lower esophagus, but it does not directly cause heartburn. Food is not typically retained at the bottom of the esophagus by a sphincter that is reluctant to open, as the lower esophageal sphincter is designed to naturally relax and open to allow food to pass into the stomach.

Heartburn Is Usually Caused by the