Question 1

Which of the following best describes the primary function of the muscularis externa in the gastrointestinal (GI) tract?

Accepted Answer

It is responsible for mechanical processing and propulsion of food through coordinated contractions.

Question 2

A patient presents with yellowing of the skin and eyes. Laboratory tests reveal an accumulation of bilirubin. Which digestive disorder is most likely responsible for these symptoms?

Accepted Answer

Jaundice

Question 3

Which of the following statements about the histological organization of the GI tract is CORRECT?

Accepted Answer

The muscularis externa contains an inner circular and an outer longitudinal layer of smooth muscle.

Question 4

A patient is diagnosed with GERD (gastroesophageal reflux disease). Which anatomical structure is most likely malfunctioning to cause this condition?

Accepted Answer

Cardiac (lower esophageal) sphincter

Question 5

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

Accepted Answer

Secretin

Question 6

A patient has difficulty absorbing vitamin B12, leading to anemia. Which gastric cell type is most likely malfunctioning?

Accepted Answer

Parietal cells

Question 7

Which of the following best explains why the small intestine is highly specialized for nutrient absorption?

Accepted Answer

It has plicae circularis, villi, and microvilli that greatly increase surface area.

Question 8

Which of the following is a function of the large intestine but NOT the small intestine?

Accepted Answer

Synthesis of vitamin K by bacterial flora

Question 9

A patient with a blockage at the sphincter of Oddi would have impaired delivery of which substances into the duodenum?

Accepted Answer

Both bile and pancreatic juice

Question 10

Which of the following best describes the role of the enteric nervous system in the digestive tract?

Accepted Answer

It regulates motility and secretions through the myenteric and submucosal plexuses.

Question 11

A patient with a deficiency in brush border enzymes such as lactase would most likely experience which of the following symptoms after consuming dairy products?

Accepted Answer

Lactose intolerance symptoms such as bloating and diarrhea

Question 12

Which of the following is TRUE regarding the absorption of nutrients in the digestive system?

Accepted Answer

Carbohydrates and proteins are absorbed into blood capillaries, while lipids are absorbed via lacteals.

Question 13

A patient presents with severe abdominal pain and imaging reveals inflamed herniations in the wall of the large intestine. What is the most likely diagnosis?

Accepted Answer

Diverticulitis

Question 14

Which of the following best explains why the esophagus is lined with stratified squamous epithelium?

Accepted Answer

To protect against abrasion from swallowed food

Question 15

Which of the following correctly matches the digestive hormone with its primary effect?

Accepted Answer

Cholecystokinin (CCK) – stimulates release of pancreatic enzymes and bile

Question 16

A patient with a viral infection of the parotid glands is most likely suffering from which condition?

Accepted Answer

Mumps

Question 17

Which of the following structures is responsible for anchoring the small intestine to the posterior abdominal wall?

Accepted Answer

Mesentery

Question 18

Which of the following is a correct sequence for the passage of bile from the liver to the duodenum?

Accepted Answer

Right/left hepatic ducts → common hepatic duct → cystic duct → common bile duct → duodenum

Question 19

A patient with chronic alcohol abuse develops scarring of the liver. Which condition does this describe?

Accepted Answer

Cirrhosis

Question 20

Which of the following best describes the process of peristalsis?

Accepted Answer

The rhythmic contraction of smooth muscle to propel food through the GI tract

The Digestive System: Structure, Function, and Disorders

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