Question 1

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

Accepted Answer

It provides routes for blood vessels, lymphatics, and nerves to reach the intestines, holds organs in place, and stores fat.

Question 2

A patient presents with severe abdominal pain after a ruptured appendix. Which condition is most likely, and what is the primary danger if left untreated?

Accepted Answer

Peritonitis; widespread infection leading to sepsis

Question 3

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

Accepted Answer

Muscularis externa

Question 4

During carbohydrate digestion, which enzyme is responsible for the initial breakdown of starch in the mouth?

Accepted Answer

Salivary amylase

Question 5

Which of the following statements about the enteric nervous system is TRUE?

Accepted Answer

It is also known as the 'gut brain' and can function independently of the central nervous system.

Question 6

A patient with a hiatal hernia is most likely to experience which of the following symptoms due to the anatomical abnormality?

Accepted Answer

Heartburn caused by gastroesophageal reflux

Question 7

Which of the following best explains why patients with celiac disease experience malabsorption?

Accepted Answer

Destruction of intestinal villi by immune cells in response to gluten

Question 8

Which of the following is a correct sequence of events in the chemical digestion and absorption of lipids?

Accepted Answer

Emulsification by bile salts → digestion by pancreatic lipase → micelle formation → diffusion into enterocytes → chylomicron formation → transport into lacteals

Question 9

Which of the following equations correctly represents the reaction catalyzed by carbonic anhydrase in parietal cells during HCl secretion?

Accepted Answer

$$\mathrm{CO_2$ + H_2O \xrightarrow{carbonic\ anhydrase} H_2CO_3 \rightarrow H^+ + $$HCO_3$$^-}$$

Question 10

A patient with a deficiency in intrinsic factor will most likely develop which condition, and why?

Accepted Answer

Pernicious anemia, due to impaired absorption of vitamin B12

Question 11

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

Accepted Answer

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

Question 12

Which of the following is a function of the bacterial flora in the large intestine?

Accepted Answer

Synthesis of vitamin K and some B vitamins

Question 13

A patient with lactose intolerance experiences diarrhea after consuming dairy products. What is the physiological explanation for this symptom?

Accepted Answer

Undigested lactose creates an osmotic gradient that prevents water absorption, leading to diarrhea.

Question 14

Which of the following best explains why a low-fiber diet can lead to diverticulosis in the large intestine?

Accepted Answer

Low fiber increases pressure in the colon, causing mucosal herniations (diverticula).

Question 15

Which of the following is TRUE regarding the absorption of nutrients in the small intestine?

Accepted Answer

Glucose and galactose are absorbed via cotransport with Na+ across the apical membrane.

Question 16

Which of the following is a correct description of segmentation in the small intestine?

Accepted Answer

Nonadjacent segments contract and relax, mixing food and digestive juices.

Question 17

Which of the following best describes the function of bile salts in digestion?

Accepted Answer

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

Question 18

A patient with a blockage of the cystic duct would most likely experience which of the following symptoms?

Accepted Answer

Jaundice due to buildup of bile pigments in the blood

Question 19

Which of the following is the correct order of the layers of the alimentary canal from innermost to outermost?

Accepted Answer

Mucosa → Submucosa → Muscularis externa → Serosa

Chapter 23: The Digestive System - Anatomy & Physiology II Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards