ATI RN
Digestive System Mcq Questions Questions
Question 1 of 5
Which gastric secretion is necessary for the absorption of vitamin B12 in the small intestine?
Correct Answer: C
Rationale: Intrinsic factor, secreted by parietal cells in the stomach, binds to vitamin B12, enabling its absorption in the ileum of the small intestine.
Question 2 of 5
A 40-year-old patient presents with frequent episodes of heartburn, regurgitation, and a sour taste in the mouth after meals. Symptoms are worse when lying down or bending over. Which of the following conditions is the most likely cause of these symptoms?
Correct Answer: B
Rationale: Hiatal hernia allows acid reflux into the esophagus, worsened by lying down or bending, causing heartburn and regurgitation.
Question 3 of 5
If the sphincter at the top of the stomach is not working properly what do we suffer from?
Correct Answer: A
Rationale: A malfunctioning lower esophageal sphincter allows acid reflux, causing heartburn. Constipation, heart attacks, and diarrhea are unrelated to this sphincter.
Question 4 of 5
The intestine has a large surface area. Why?
Correct Answer: C
Rationale: A large surface area, due to villi and microvilli, enhances nutrient absorption efficiency.
Question 5 of 5
Peptide hormones are made of protein and are water soluble. They can therefore:
Correct Answer: B
Rationale: Peptide hormones bind to membrane receptors, triggering secondary messengers inside the cell.