ATI RN
Digestive System Exam Questions Questions
Question 1 of 5
A digestive enzyme, salivary amylase in the saliva begins digestion of-
Correct Answer: A
Rationale: Saliva contains the enzyme amylase that breaks some starches down into maltose and dextrin. Thus, digestion of food occurs within the mouth, even before the food reaches the stomach.
Question 2 of 5
Food tests were carried out on four different substances. Which substance contained both protein and reducing sugar?
Correct Answer: A
Rationale: Substances testing positive for both the biuret test (protein) and Benedict's test (reducing sugar) indicate the presence of both protein and reducing sugars.
Question 3 of 5
Which of these human teeth are used for grinding?
Correct Answer: D
Rationale: Molars are flat, broad teeth specialized for grinding food.
Question 4 of 5
Which layer of GI tract forms the innermost lining and continuously secretes mucus?
Correct Answer: D
Rationale: The mucosa is the innermost layer of the GI tract, lined with epithelial cells that secrete mucus to protect the tract and lubricate food passage.
Question 5 of 5
Which of the following glands produces saliva?
Correct Answer: D
Rationale: The parotid gland is one of the major salivary glands that produce saliva, which initiates starch digestion and lubricates food.