Question 1

Which of the following best describes the primary function of the small intestine?

Accepted Answer

Absorption of digested nutrients and most water, as well as completion of chemical digestion

Question 2

A patient has a mutation that prevents the formation of tight junctions between the epithelial cells of the stomach. Which of the following is the most likely consequence?

Accepted Answer

Leakage of gastric acid into underlying tissues, leading to tissue damage and ulcers

Question 3

During the cephalic phase of gastric secretion, which of the following events occurs in response to the sight, smell, or thought of food?

Accepted Answer

Stimulation of parietal cells to secrete hydrochloric acid via vagal nerve activation

Question 4

Which of the following best explains why bile salts are important for lipid digestion?

Accepted Answer

They emulsify fats, increasing the surface area for pancreatic lipase action

Question 5

A patient with a blocked common bile duct would have difficulty digesting which type of nutrient, and why?

Accepted Answer

Lipids, because bile salts are necessary for emulsification and absorption

Question 6

Which of the following statements about the enteric nervous system (ENS) is correct?

Accepted Answer

The ENS can independently coordinate peristalsis and segmentation via short reflexes

Question 7

Which hormone is released in response to acidic chyme entering the duodenum and stimulates the pancreas to secrete bicarbonate-rich juice?

Accepted Answer

Secretin

Question 8

A patient has a deficiency in intrinsic factor. Which of the following is the most likely clinical consequence?

Accepted Answer

Impaired absorption of vitamin B$_{12}$ in the small intestine

Question 9

Which of the following best describes the process of peristalsis?

Accepted Answer

Alternating contractions of circular and longitudinal smooth muscle layers to propel contents forward

Question 10

Which of the following is a function of the large intestine?

Accepted Answer

Absorption of water and electrolytes, and formation of feces

Question 11

A patient consumes a meal high in carbohydrates. Which transporter is primarily responsible for glucose absorption at the apical surface of enterocytes in the small intestine?

Accepted Answer

SGLT (Sodium-Glucose Linked Transporter)

Question 12

Which of the following best explains why alcohol is absorbed rapidly on an empty stomach?

Accepted Answer

Alcohol is lipid-soluble and can diffuse across the gastric mucosa, especially when the stomach is empty

Question 13

Which of the following is a correct sequence of events during swallowing (deglutition)?

Accepted Answer

Elevation of the larynx, closure of the epiglottis, relaxation of the upper esophageal sphincter

Question 14

Which of the following best describes the role of the hepatic portal vein?

Accepted Answer

It carries nutrient-rich blood from the digestive tract to the liver for processing

Question 15

A patient with a deficiency in pancreatic enzymes would most likely have difficulty digesting which of the following?

Accepted Answer

Proteins, lipids, and carbohydrates

Question 16

Which of the following statements about the absorption of lipids in the small intestine is correct?

Accepted Answer

Chylomicrons are formed in enterocytes and enter lacteals for transport via the lymphatic system

Question 17

Which of the following best explains the function of the myenteric plexus?

Accepted Answer

It coordinates the motility of the muscularis externa, including peristalsis and segmentation

Question 18

Which of the following is a correct description of the defecation reflex?

Accepted Answer

It is initiated by stretch receptors in the rectum, leading to relaxation of the internal anal sphincter and voluntary relaxation of the external anal sphincter

Question 19

Which of the following best describes the role of gastrin in the digestive process?

Accepted Answer

It stimulates secretion of hydrochloric acid and pepsinogen, and increases gastric motility

The Digestive System: Structure, Function, and Processes

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