Which of the following statements is true?
A)Heartburn often results when the gastroesophageal sphincter fails to close properly.
B)Cystic fibrosis is an infectious disease that causes the muscles that control swallowing to malfunction.
C)A thin layer of chyme protects the lining of the digestive tract from being broken down by enzymes.
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 (a muscular ring that controls the passage of food and prevents stomach acid from entering the esophagus) to close properly.

B is incorrect because cystic fibrosis is a genetic disorder that affects the function of the exocrine glands, leading to the production of thick and sticky mucus that clogs the lungs and other organs. It does not affect the muscles that control swallowing.

C is incorrect because chyme (a semi-fluid mixture of partially digested food and digestive secretions, such as gastric juice) contains enzymes that help to break down food and does not protect the lining of the digestive tract.

D is incorrect because hydrochloric acid (HCl) is produced in the stomach and aids in the digestion of protein, not fats. The digestion of fats begins in the small intestine with the release of bile from the gallbladder and the action of pancreatic lipase.

Which of the Following Statements Is True