Question 1

Which of the following best describes the primary function of the alimentary canal in the digestive system?

Accepted Answer

To physically and chemically break down food and absorb nutrients

Question 2

Which structure is considered an accessory organ of the digestive system and directly contacts food during ingestion?

Accepted Answer

Teeth

Question 3

A patient presents with severe abdominal pain and rebound tenderness. Imaging reveals leakage of intestinal contents into the peritoneal cavity. What is the most likely diagnosis?

Accepted Answer

Peritonitis

Question 4

Which layer of the alimentary canal is responsible for peristalsis and segmentation?

Accepted Answer

Muscularis externa

Question 5

During the cephalic phase of gastric secretion, which nerve is primarily responsible for stimulating acid production in the stomach?

Accepted Answer

Vagus nerve

Question 6

Which of the following best explains why the stomach can expand significantly after a large meal without a dramatic increase in internal pressure?

Accepted Answer

The presence of rugae and receptive relaxation of smooth muscle

Question 7

A patient with a history of chronic GERD is at increased risk for which of the following complications?

Accepted Answer

Esophageal cancer

Question 8

Which of the following statements about the small intestine is correct?

Accepted Answer

The jejunum is the primary site for chemical digestion and absorption.

Question 9

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

Accepted Answer

They emulsify lipids, increasing surface area for pancreatic lipase action.

Question 10

A patient has a genetic deficiency in the enzyme lactase. After consuming dairy products, they experience abdominal cramping and diarrhea. What is the physiological explanation for these symptoms?

Accepted Answer

Lactose remains undigested, drawing water into the intestine by osmosis.

Question 11

Which of the following is true regarding the absorption of vitamin B12?

Accepted Answer

It requires binding to intrinsic factor produced by parietal cells.

Question 12

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

Accepted Answer

It drains nutrient-rich blood from the digestive organs to the liver for processing.

Question 13

Which of the following is a function of the normal flora (gut bacteria) in the large intestine?

Accepted Answer

They synthesize vitamin K and metabolize undigested carbohydrates.

Question 14

A patient is prescribed a drug that blocks the H+/K+ ATPase in parietal cells. What is the expected effect on gastric physiology?

Accepted Answer

Decreased secretion of hydrochloric acid

Question 15

Which of the following best explains why opiate narcotics can cause constipation?

Accepted Answer

They decrease motility, allowing excessive water absorption from fecal material.

Question 16

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

Accepted Answer

Voluntary phase → pharyngeal phase → esophageal phase

Question 17

Which of the following best describes the role of the enteric nervous system (ENS) in digestive function?

Accepted Answer

It regulates short reflexes that control secretion and motility within the alimentary canal.

Question 18

A patient with a history of gastric surgery presents with symptoms of anemia and neurological deficits. Laboratory tests reveal low vitamin B12 levels. What is the most likely cause?

Accepted Answer

Loss of parietal cells leading to decreased intrinsic factor production

Question 19

Which of the following best explains why the large intestine lacks villi and microvilli?

Accepted Answer

Its primary function is not nutrient absorption but water and electrolyte absorption.

Question 20

Which of the following is a direct result of the positive feedback loop involving gastrin in the gastric phase?

Accepted Answer

Increased acid secretion and enhanced protein digestion

Digestive System: Structure, Function, and Processes

Guida di studio - Domande di pratica

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