,NURS 231 / BIOD 331 Pathophysiology Module 7 Exam |
Portage Learning| Q&A | 26/27 Edition (PDF)
1. Which of the following correctly lists the accessory organs of the gastrointestinal system?
A) Mouth, esophagus, and stomach
B) Duodenum, jejunum, and ileum
C) Salivary glands, liver, and pancreas
D) Cecum, colon, and rectum
Correct Answer: Salivary glands, liver, and pancreas
Rationale: Accessory organs assist in digestion but are not part of the continuous alimentary canal. The
salivary glands produce saliva containing enzymes; the liver produces bile; the pancreas secretes
digestive enzymes and bicarbonate. The other options list parts of the alimentary canal itself.
2. What is the primary function of the gastrointestinal tract?
A) To produce hormones for metabolic regulation
B) To digest food and absorb nutrients into the bloodstream
C) To filter toxins from the blood
D) To produce red blood cells
Correct Answer: To digest food and absorb nutrients into the bloodstream
Rationale: The primary function of the GI tract is to break down ingested food into its constituent
nutrients through mechanical and chemical digestion, and then absorb those nutrients, electrolytes, and
water across the intestinal mucosa into the blood or lymph. The liver filters toxins and the bone marrow
produces red blood cells.
3. The liver is responsible for each of the following functions EXCEPT:
A) Producing bile
B) Storing vitamins and minerals
,C) Releasing insulin
D) Synthesizing plasma proteins
Correct Answer: Releasing insulin
Rationale: The liver performs numerous essential metabolic, synthetic, and storage functions, such as
producing bile for fat digestion, synthesizing plasma proteins (e.g., albumin, clotting factors), and storing
vitamins and minerals. Insulin is released by the beta cells of the pancreas, not the liver.
4. Which of the following is a function of the mucosal layer of the GI wall?
A) Producing mucus that lubricates and protects the inner surface
B) Providing the primary force for peristalsis
C) Containing the major blood vessels and nerves
D) Forming the outermost protective covering
Correct Answer: Producing mucus that lubricates and protects the inner surface
Rationale: The mucosal layer is the innermost layer of the GI wall. It produces mucus that lubricates and
protects the inner surface of the alimentary canal, secretes digestive enzymes, absorbs the breakdown
products of digestion, and maintains a barrier to prevent the entry of harmful substances.
5. What is the correct order of the four layers of the gastrointestinal wall, from innermost to outermost?
A) Serosa, muscularis externa, submucosa, mucosa
B) Mucosa, submucosa, muscularis externa, serosa
C) Submucosa, mucosa, serosa, muscularis externa
D) Muscularis externa, serosa, mucosa, submucosa
Correct Answer: Mucosa, submucosa, muscularis externa, serosa
, Rationale: The GI wall consists of four concentric layers. From the lumen outward, they are the mucosa
(innermost), submucosa, muscularis externa, and serosa (outermost). This layered structure supports
the specialized functions of digestion, absorption, and motility.
6. Which layer of the GI wall contains the major blood vessels, lymphatics, and the submucosal plexus?
A) Mucosa
B) Submucosa
C) Muscularis externa
D) Serosa
Correct Answer: Submucosa
Rationale: The submucosa is a layer of dense connective tissue that contains the major blood vessels,
lymphatics, and the submucosal plexus (Meissner's plexus). This layer provides structural support and
nourishment to the surrounding tissues.
7. Salivary amylase is an enzyme that begins the digestion of which nutrient?
A) Proteins
B) Carbohydrates
C) Fats
D) Nucleic acids
Correct Answer: Carbohydrates
Rationale: Salivary amylase (ptyalin) initiates the chemical digestion of starches (carbohydrates) in the
mouth. Lingual lipase begins the digestion of fats, while protein digestion begins in the stomach.
8. Which of the following is the most common cause of peptic ulcer disease (PUD)?
A) Excessive alcohol consumption
B) Helicobacter pylori infection
Portage Learning| Q&A | 26/27 Edition (PDF)
1. Which of the following correctly lists the accessory organs of the gastrointestinal system?
A) Mouth, esophagus, and stomach
B) Duodenum, jejunum, and ileum
C) Salivary glands, liver, and pancreas
D) Cecum, colon, and rectum
Correct Answer: Salivary glands, liver, and pancreas
Rationale: Accessory organs assist in digestion but are not part of the continuous alimentary canal. The
salivary glands produce saliva containing enzymes; the liver produces bile; the pancreas secretes
digestive enzymes and bicarbonate. The other options list parts of the alimentary canal itself.
2. What is the primary function of the gastrointestinal tract?
A) To produce hormones for metabolic regulation
B) To digest food and absorb nutrients into the bloodstream
C) To filter toxins from the blood
D) To produce red blood cells
Correct Answer: To digest food and absorb nutrients into the bloodstream
Rationale: The primary function of the GI tract is to break down ingested food into its constituent
nutrients through mechanical and chemical digestion, and then absorb those nutrients, electrolytes, and
water across the intestinal mucosa into the blood or lymph. The liver filters toxins and the bone marrow
produces red blood cells.
3. The liver is responsible for each of the following functions EXCEPT:
A) Producing bile
B) Storing vitamins and minerals
,C) Releasing insulin
D) Synthesizing plasma proteins
Correct Answer: Releasing insulin
Rationale: The liver performs numerous essential metabolic, synthetic, and storage functions, such as
producing bile for fat digestion, synthesizing plasma proteins (e.g., albumin, clotting factors), and storing
vitamins and minerals. Insulin is released by the beta cells of the pancreas, not the liver.
4. Which of the following is a function of the mucosal layer of the GI wall?
A) Producing mucus that lubricates and protects the inner surface
B) Providing the primary force for peristalsis
C) Containing the major blood vessels and nerves
D) Forming the outermost protective covering
Correct Answer: Producing mucus that lubricates and protects the inner surface
Rationale: The mucosal layer is the innermost layer of the GI wall. It produces mucus that lubricates and
protects the inner surface of the alimentary canal, secretes digestive enzymes, absorbs the breakdown
products of digestion, and maintains a barrier to prevent the entry of harmful substances.
5. What is the correct order of the four layers of the gastrointestinal wall, from innermost to outermost?
A) Serosa, muscularis externa, submucosa, mucosa
B) Mucosa, submucosa, muscularis externa, serosa
C) Submucosa, mucosa, serosa, muscularis externa
D) Muscularis externa, serosa, mucosa, submucosa
Correct Answer: Mucosa, submucosa, muscularis externa, serosa
, Rationale: The GI wall consists of four concentric layers. From the lumen outward, they are the mucosa
(innermost), submucosa, muscularis externa, and serosa (outermost). This layered structure supports
the specialized functions of digestion, absorption, and motility.
6. Which layer of the GI wall contains the major blood vessels, lymphatics, and the submucosal plexus?
A) Mucosa
B) Submucosa
C) Muscularis externa
D) Serosa
Correct Answer: Submucosa
Rationale: The submucosa is a layer of dense connective tissue that contains the major blood vessels,
lymphatics, and the submucosal plexus (Meissner's plexus). This layer provides structural support and
nourishment to the surrounding tissues.
7. Salivary amylase is an enzyme that begins the digestion of which nutrient?
A) Proteins
B) Carbohydrates
C) Fats
D) Nucleic acids
Correct Answer: Carbohydrates
Rationale: Salivary amylase (ptyalin) initiates the chemical digestion of starches (carbohydrates) in the
mouth. Lingual lipase begins the digestion of fats, while protein digestion begins in the stomach.
8. Which of the following is the most common cause of peptic ulcer disease (PUD)?
A) Excessive alcohol consumption
B) Helicobacter pylori infection
