Q: Which of the following equations best represents the chemical breakdown of starch by salivary amylase?

$$\text{Starch} + \text{Salivary Amylase} \rightarrow \text{Maltose}$$

Question 1

Which layer of the alimentary canal contains the largest blood vessels and lymphatics responsible for carrying lipids absorbed from the digestive tract?

Accepted Answer

Submucosa

Question 2

During swallowing, which phase is characterized by the elevation of the soft palate and closure of the uvula to prevent food from entering the nasal cavity?

Accepted Answer

Pharyngeal phase

Question 3

What is the primary function of mucus secreted by the mucosa in the digestive tract?

Accepted Answer

Acts as a buffer to protect underlying tissues

Question 4

At the gastroesophageal junction, the epithelium changes from stratified squamous to which type?

Accepted Answer

Simple columnar

Question 5

Which cranial nerve is primarily responsible for voluntary mastication (chewing)?

Accepted Answer

CN V (Trigeminal)

Question 6

Which of the following correctly describes the muscularis externa of the stomach?

Accepted Answer

It has three layers: longitudinal, circular, and oblique

Question 7

Which cell type in the stomach secretes hydrochloric acid (HCl) and intrinsic factor?

Accepted Answer

Parietal cells

Question 8

A patient presents with ascites. Which of the following is NOT a common cause of this condition?

Accepted Answer

Diabetes mellitus

Question 9

Which process involves the rhythmic contraction and relaxation of the muscularis externa to propel food through the digestive tract?

Accepted Answer

Peristalsis

Question 10

Which enzyme initiates carbohydrate digestion in the mouth?

Accepted Answer

Salivary amylase

Question 11

Which of the following best describes the function of the serosa in the alimentary canal?

Accepted Answer

Provides a protective outer layer and reduces friction

Question 12

Which of the following is a correct sequence of the layers of the alimentary canal from innermost to outermost?

Accepted Answer

Mucosa, submucosa, muscularis externa, serosa

Question 13

Which of the following is TRUE regarding segmentation in the small intestine?

Accepted Answer

It mixes food and increases contact with digestive enzymes

Question 14

Which of the following best explains the role of intrinsic factor secreted by parietal cells?

Accepted Answer

Facilitates vitamin B12 absorption in the small intestine

Question 15

A patient with a peptic ulcer is found to have H. pylori infection. What is the most likely mechanism by which H. pylori causes ulceration?

Accepted Answer

Erodes the mucosal barrier, allowing acid to damage the stomach wall

Question 16

Which brush border enzymes are responsible for the final breakdown of disaccharides in the small intestine?

Accepted Answer

Sucrase, maltase, and lactase

Question 17

Which of the following equations best represents the chemical breakdown of starch by salivary amylase?

Accepted Answer

$$	ext{Starch} + 	ext{Salivary Amylase} ightarrow 	ext{Maltose}$$

Question 18

Which phase of swallowing is under voluntary control and involves the movement of the bolus from the mouth to the pharynx?

Accepted Answer

Buccal phase

Question 19

Which of the following statements about the mesentery is correct?

Accepted Answer

It anchors digestive organs and contains blood vessels, nerves, and lymphatics

Question 20

Which of the following best describes the function of chief cells in the stomach?

Accepted Answer

Produce pepsinogen and lipases for protein and lipid digestion

Digestive System: Structure, Function, and Processes

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