ATI LPN
NCLEX Questions Gastrointestinal System Questions
Question 1 of 5
Digestion begins in the mouth. Which of the following statement is INCORRECT?
Correct Answer: D
Rationale: Choices A, B, and C are correct: the tongue manipulates food, saliva (with amylase) converts starches to sugars, and it positions food for chewing. D is incorrect because chewing enhances digestion by breaking food into smaller pieces, but 'digestive juices reacting more easily' is vague and not a primary mouth function—digestion continues later with gastric and intestinal juices.
Question 2 of 5
The function of the cardiac sphincter is to prevent backflow of acid chyme from the
Correct Answer: B
Rationale: The cardiac (lower esophageal) sphincter prevents acid chyme from refluxing into the esophagus, making B correct.
Question 3 of 5
Where does the digestion of starch begin?
Correct Answer: C
Rationale: Starch digestion begins in the mouth with salivary amylase, making C correct.
Question 4 of 5
Which of the following contributes to the digestion of lipids?
Correct Answer: C
Rationale: The gallbladder releases bile to emulsify lipids, making C correct.
Question 5 of 5
The pH of various areas within the digestive tract was taken and plotted on a graph as shown above. The reading labelled X was most likely obtained from the
Correct Answer: B
Rationale: A low pH reading (X) matches the acidic stomach environment, making B correct.