BIOD 151 Module 3 Exam Portage Learning Questions and Answers 2026
Practice Set
Section 1: Digestive Processes & Histology
1. Which of the following describes "Segmentation" in the small intestine?
A. The rhythmic wave that moves food forward.
B. Localized contractions that mix food with digestive juices.
C. The voluntary act of swallowing.
D. The chemical breakdown of fats.
Rationale: While Peristalsis is the "conveyor belt" that moves food
downward, Segmentation consists of non-adjacent contractions that move
food back and forth. This maximizes the mixing of food with enzymes and
increases the time food spends in contact with the absorptive mucosal
wall.
2. Which layer of the alimentary canal contains the blood vessels and
lymphatic vessels needed for absorption?
A. Mucosa
B. Submucosa
C. Muscularis Externa
D. Serosa
Rationale: The Submucosa is a layer of dense irregular connective tissue. It
houses the "plumbing" of the digestive tract, including blood vessels,
nerves, and lymphatic vessels (lacteals) that transport absorbed nutrients
to the rest of the body.
3. The "Intrinsic Nerve Plexus" that regulates motility in the muscularis
externa is the:
A. Submucosal Plexus
B. Myenteric Plexus
C. Celiac Plexus
D. Vagus Nerve
Rationale: The Myenteric Plexus (Auerbach's plexus) is situated between
the circular and longitudinal muscle layers. It is the primary controller of GI
motility, coordinating the strength and frequency of contractions.
, 4. Which type of epithelium primarily lines the mouth, esophagus, and anus
to protect against abrasion?
A. Simple Columnar
B. Simple Squamous
C. Stratified Squamous
D. Pseudostratified Columnar
Rationale: Areas subject to significant friction and abrasion require
Stratified Squamous epithelium for protection. In contrast, the stomach and
intestines use Simple Columnar for secretion and absorption.
5. The serous membrane that hangs like a "fatty apron" over the abdominal
viscera is the:
A. Mesentery
B. Greater Omentum
C. Falciform Ligament
D. Lesser Omentum
Rationale: The Greater Omentum extends from the greater curvature of the
stomach. It stores fat and contains many lymph nodes to help localize and
fight peritoneal infections.
Section 2: Mouth, Pharynx, & Esophagus
6. Which salivary gland is located anterior to the ear and is the largest of the
three?
A. Submandibular
B. Sublingual
C. Parotid
D. Buccal
Rationale: The Parotid glands secrete a watery fluid rich in Salivary Amylase.
Inflammation of these glands is a hallmark of the mumps virus.
7. Salivary Amylase begins the chemical digestion of which macronutrient in
the mouth?
A. Proteins
B. Lipids
C. Carbohydrates
D. Nucleic Acids
, Rationale: Chemical digestion starts in the mouth. Amylase breaks down complex
polysaccharides (starches) into smaller oligosaccharides.
8. What is the medical term for the act of "Swallowing"?
A. Mastication
B. Deglutition
C. Peristalsis
D. Absorption
Rationale: Mastication is chewing. Deglutition is the complex process of moving a
bolus from the mouth to the stomach, involving both voluntary and involuntary
steps.
9. The "Esophageal Hiatus" is defined as:
A. A sphincter at the bottom of the esophagus.
B. An opening in the diaphragm through which the esophagus passes.
C. A storage sac for food.
D. A type of digestive enzyme.
Rationale: The esophagus must pass from the thoracic cavity to the abdominal
cavity via the hiatus in the diaphragm. A protrusion of the stomach through this
hole is called a Hiatal Hernia.
10. Which structure prevents acid reflux from the stomach into the
esophagus?
A. Upper Esophageal Sphincter
B. Pyloric Sphincter
C. Lower Esophageal (Cardiac) Sphincter
D. Ileocecal Valve
Rationale: The Lower Esophageal Sphincter stays closed to prevent highly acidic
gastric juices from splashing back into the esophagus. Malfunction leads to
GERD.
Section 3: The Stomach
11. Which region of the stomach connects directly to the small intestine?
A. Cardia
B. Fundus
C. Body
D. Pylorus
Practice Set
Section 1: Digestive Processes & Histology
1. Which of the following describes "Segmentation" in the small intestine?
A. The rhythmic wave that moves food forward.
B. Localized contractions that mix food with digestive juices.
C. The voluntary act of swallowing.
D. The chemical breakdown of fats.
Rationale: While Peristalsis is the "conveyor belt" that moves food
downward, Segmentation consists of non-adjacent contractions that move
food back and forth. This maximizes the mixing of food with enzymes and
increases the time food spends in contact with the absorptive mucosal
wall.
2. Which layer of the alimentary canal contains the blood vessels and
lymphatic vessels needed for absorption?
A. Mucosa
B. Submucosa
C. Muscularis Externa
D. Serosa
Rationale: The Submucosa is a layer of dense irregular connective tissue. It
houses the "plumbing" of the digestive tract, including blood vessels,
nerves, and lymphatic vessels (lacteals) that transport absorbed nutrients
to the rest of the body.
3. The "Intrinsic Nerve Plexus" that regulates motility in the muscularis
externa is the:
A. Submucosal Plexus
B. Myenteric Plexus
C. Celiac Plexus
D. Vagus Nerve
Rationale: The Myenteric Plexus (Auerbach's plexus) is situated between
the circular and longitudinal muscle layers. It is the primary controller of GI
motility, coordinating the strength and frequency of contractions.
, 4. Which type of epithelium primarily lines the mouth, esophagus, and anus
to protect against abrasion?
A. Simple Columnar
B. Simple Squamous
C. Stratified Squamous
D. Pseudostratified Columnar
Rationale: Areas subject to significant friction and abrasion require
Stratified Squamous epithelium for protection. In contrast, the stomach and
intestines use Simple Columnar for secretion and absorption.
5. The serous membrane that hangs like a "fatty apron" over the abdominal
viscera is the:
A. Mesentery
B. Greater Omentum
C. Falciform Ligament
D. Lesser Omentum
Rationale: The Greater Omentum extends from the greater curvature of the
stomach. It stores fat and contains many lymph nodes to help localize and
fight peritoneal infections.
Section 2: Mouth, Pharynx, & Esophagus
6. Which salivary gland is located anterior to the ear and is the largest of the
three?
A. Submandibular
B. Sublingual
C. Parotid
D. Buccal
Rationale: The Parotid glands secrete a watery fluid rich in Salivary Amylase.
Inflammation of these glands is a hallmark of the mumps virus.
7. Salivary Amylase begins the chemical digestion of which macronutrient in
the mouth?
A. Proteins
B. Lipids
C. Carbohydrates
D. Nucleic Acids
, Rationale: Chemical digestion starts in the mouth. Amylase breaks down complex
polysaccharides (starches) into smaller oligosaccharides.
8. What is the medical term for the act of "Swallowing"?
A. Mastication
B. Deglutition
C. Peristalsis
D. Absorption
Rationale: Mastication is chewing. Deglutition is the complex process of moving a
bolus from the mouth to the stomach, involving both voluntary and involuntary
steps.
9. The "Esophageal Hiatus" is defined as:
A. A sphincter at the bottom of the esophagus.
B. An opening in the diaphragm through which the esophagus passes.
C. A storage sac for food.
D. A type of digestive enzyme.
Rationale: The esophagus must pass from the thoracic cavity to the abdominal
cavity via the hiatus in the diaphragm. A protrusion of the stomach through this
hole is called a Hiatal Hernia.
10. Which structure prevents acid reflux from the stomach into the
esophagus?
A. Upper Esophageal Sphincter
B. Pyloric Sphincter
C. Lower Esophageal (Cardiac) Sphincter
D. Ileocecal Valve
Rationale: The Lower Esophageal Sphincter stays closed to prevent highly acidic
gastric juices from splashing back into the esophagus. Malfunction leads to
GERD.
Section 3: The Stomach
11. Which region of the stomach connects directly to the small intestine?
A. Cardia
B. Fundus
C. Body
D. Pylorus
