Question 1

Which of the following best describes the primary function of bile in the digestive process?

Accepted Answer

Bile emulsifies dietary fats, increasing their surface area for enzymatic digestion.

Question 2

A patient with cystic fibrosis has a mutation in the CFTR channel. Which of the following best explains how this mutation affects digestion?

Accepted Answer

It impairs chloride ion transport, resulting in thickened secretions that block pancreatic ducts.

Question 3

Which of the following is the correct sequence of events during the swallowing reflex?

Accepted Answer

Elevation of the soft palate, closure of the glottis, relaxation of the upper esophageal sphincter

Question 4

Which of the following best describes the role of cholecystokinin (CCK) in digestion?

Accepted Answer

CCK stimulates the release of bile from the gallbladder and pancreatic enzymes.

Question 5

Which of the following is a key difference between segmentation and peristalsis in the gastrointestinal tract?

Accepted Answer

Segmentation mixes intestinal contents, while peristalsis propels contents forward.

Question 6

A patient presents with jaundice and steatorrhea (fatty stools). Which of the following is the most likely cause?

Accepted Answer

Obstruction of the common bile duct

Question 7

Which of the following best explains the process of carbohydrate digestion and absorption in the small intestine?

Accepted Answer

Carbohydrates are digested by pancreatic amylase and brush border enzymes, then absorbed via secondary active transport with sodium.

Question 8

Which of the following hormones is primarily responsible for stimulating the secretion of hydrochloric acid in the stomach?

Accepted Answer

Gastrin

Question 9

During the cephalic phase of gastric regulation, which of the following events occurs?

Accepted Answer

Stimulation of gastric secretions by the sight, smell, or thought of food

Question 10

Which of the following best describes the absorption of fat-soluble vitamins in the digestive tract?

Accepted Answer

They are absorbed with dietary fats into lacteals as part of chylomicrons.

Question 11

Which of the following best explains the role of the enteric nervous system (ENS) in gastrointestinal function?

Accepted Answer

The ENS independently regulates motility, secretion, and blood flow in the GI tract.

Question 12

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

Accepted Answer

Stomach

Question 13

Which of the following best describes the process of defecation?

Accepted Answer

It involves voluntary relaxation of the external anal sphincter and contraction of the rectal muscles.

Question 14

Which of the following is a function of secretin in the digestive system?

Accepted Answer

Stimulates the release of pancreatic bicarbonate to neutralize acidic chyme.

Question 15

Which of the following best explains the effect of a gallstone blocking the common bile duct?

Accepted Answer

Impaired digestion and absorption of fats

Question 16

Which of the following is the correct formula for calculating the net absorption rate ($$N) of a $$nutrient in the small intestine, given the amount ingested ($$I) $$and the amount excreted in feces ($$E$$)?

Accepted Answer

$$N = I - E$$

Question 17

Which of the following best describes the effect of parasympathetic stimulation on the digestive system?

Accepted Answer

It stimulates motility and increases digestive secretions.

Question 18

Which of the following is a likely consequence of a deficiency in brush border enzymes in the small intestine?

Accepted Answer

Malabsorption of disaccharides leading to osmotic diarrhea

Question 19

Which of the following best explains the difference between the submucosal and myenteric plexuses of the enteric nervous system?

Accepted Answer

The submucosal plexus primarily regulates glandular secretions, while the myenteric plexus controls gastrointestinal motility.

Question 20

Which of the following best describes the process of emesis (vomiting)?

Accepted Answer

It involves coordinated contraction of the diaphragm and abdominal muscles, and relaxation of the lower esophageal sphincter.

Study Guide: The Digestive System (Ch. 22) – Anatomy & Physiology

Study Guide - Practice Questions

Study Guide - Flashcards