Which of the following statements is true?
A)A thin layer of chyme protects the lining of the digestive tract from being broken down by enzymes.
B)Heartburn often results when the gastroesophageal sphincter fails to close properly.
C)Cystic fibrosis is an infectious disease that causes the muscles that control swallowing to malfunction.
D)Hydrochloric acid (HCl)begins the partial digestion of fats in the small intestine.

Question

Quizplus · Accepted Answer

Heartburn occurs when stomach acid flows back into the esophagus due to the failure of the gastroesophageal sphincter to close properly. A is incorrect as chyme does contain enzymes that can breakdown the lining of the digestive tract if it were not protected by mucus. C is incorrect as cystic fibrosis is a genetic disorder that affects mucus production, not the muscles related to swallowing. D is incorrect as hydrochloric acid is produced by the stomach and begins the partial digestion of proteins, not fats.

Which of the Following Statements Is True