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

Question 1

Which of the following best describes the process of segmentation in the digestive tract?

Accepted Answer

It mixes food with digestive juices and increases contact with the mucosa by local constriction of the intestine.

Question 2

Which enzyme is primarily responsible for the chemical digestion of carbohydrates in the mouth?

Accepted Answer

Salivary amylase

Question 3

A patient has a blockage in the pancreatic duct. Which digestive process will be most affected?

Accepted Answer

Chemical digestion of fats, proteins, and carbohydrates in the small intestine

Question 4

Which of the following is NOT a function of saliva?

Accepted Answer

Provides a mucosal barrier to protect the stomach lining

Question 5

During the gastric phase of gastric secretion, which of the following stimulates the release of gastric juice?

Accepted Answer

Distension of the stomach and presence of peptides

Question 6

Which structure increases the surface area of the small intestine for absorption by forming finger-like projections?

Accepted Answer

Villi

Question 7

A patient is unable to absorb vitamin B12 due to lack of intrinsic factor. Which organ is most likely affected?

Accepted Answer

Stomach

Question 8

Which of the following best describes the role of bile in digestion?

Accepted Answer

It emulsifies fats, increasing their surface area for enzyme action.

Question 9

Which hormone stimulates the release of pancreatic juice rich in bicarbonate ions?

Accepted Answer

Secretin

Question 10

Which of the following mechanisms is responsible for the absorption of glucose in the small intestine?

Accepted Answer

Secondary active transport with sodium ions

Question 11

A patient presents with jaundice due to obstruction of the common bile duct. Which of the following is most likely to be impaired?

Accepted Answer

Emulsification and absorption of dietary fats

Question 12

Which layer of the digestive tract is responsible for peristalsis and segmentation?

Accepted Answer

Muscularis externa

Question 13

Which of the following correctly matches the digestive enzyme with its substrate?

Accepted Answer

Amylase: Starch

Question 14

Which of the following is a modification of the small intestine that enhances absorption?

Accepted Answer

Circular folds

Question 15

A patient with damage to the myenteric nerve plexus would most likely experience problems with:

Accepted Answer

Motility of the GI tract

Question 16

Which of the following best explains why fats are absorbed into the lymphatic system rather than directly into the blood?

Accepted Answer

Fats are too large to pass through the capillary walls of the blood vessels.

Question 17

Which phase of gastric secretion is triggered by the sight, smell, taste, or thought of food?

Accepted Answer

Cephalic phase

Question 18

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

Accepted Answer

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

Question 19

Which of the following is the correct sequence of layers in the wall of the alimentary canal, from innermost to outermost?

Accepted Answer

Mucosa, submucosa, muscularis externa, serosa

Question 20

A patient is unable to digest proteins efficiently due to a deficiency in gastric chief cells. Which enzyme is most likely lacking?

Accepted Answer

Pepsin

Study Notes: The Digestive System (Anatomy & Physiology)

Study Guide - Practice Questions