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BIOL252 Human Anatomy & Physiology II with Lab
Module 6 Exam Actual Exam 2026/2027 – Complete
Exam-Style Questions with Detailed Rationales | 100%
Verified – Pass Guaranteed – A+ Graded
Digestive System Overview & GI Tract Layers
Q1: Which of the following correctly lists the four primary processes of the digestive system in
the order they occur for a bite of food?
A. Ingestion, Digestion, Absorption, Defecation
B. Propulsion, Absorption, Secretion, Ingestion
C. Digestion, Ingestion, Absorption, Elimination
D. Ingestion, Secretion, Digestion, Propulsion
Correct Answer: A
Rationale: This choice is correct because it logically follows the path of food: taking it in
(ingestion), breaking it down (digestion), moving nutrients into the blood (absorption), and
removing waste (defecation).
Q2: A student is examining a slide of the digestive tract and identifies a layer containing dense
connective tissue, blood vessels, and the submucosal plexus. Which layer is she observing?
A. Mucosa
B. Submucosa
C. Muscularis externa
D. Serosa
Correct Answer: B
Rationale: The submucosa is the connective tissue layer found just beneath the mucosa that
houses the submucosal (Meissner’s) plexus, larger blood vessels, and lymphatic vessels.
Q3: Which anatomical modification of the stomach wall allows it to expand significantly during
a large meal?
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A. Rugae
B. Plicae circulares
C. Haustra
D. Teniae coli
Correct Answer: A
Rationale: Rugae are the thick folds or wrinkles in the stomach mucosa and submucosa that
allow the stomach to stretch and increase its volume to accommodate food intake.
Q4: The enteric nervous system regulates motility and secretion largely independently of the
CNS. Which plexus is responsible for regulating the muscularis externa to cause peristalsis?
A. Meissner's plexus
B. Auerbach's myenteric plexus
C. Celiac plexus
D. Hypogastric plexus
Correct Answer: B
Rationale: Auerbach's myenteric plexus is located between the circular and longitudinal muscle
layers of the muscularis externa and is primarily responsible for controlling GI tract motility,
including peristalsis.
Q5: During a dissection, an instructor points out the outermost layer of the esophagus, which is
composed of fibrous connective tissue rather than a smooth serosa. What is this specific layer
called?
A. Visceral peritoneum
B. Adventitia
C. Parietal peritoneum
D. Mesentery
Correct Answer: B
Rationale: The esophagus is an intraperitoneal organ in the thoracic cavity, so its outermost layer
is an adventitia (fibrous connective tissue) rather than a serous membrane (serosa), which is
found on intraperitoneal organs.
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Q6: Which of the following is NOT a function of the digestive system?
A. Mechanical breakdown of food
B. Filtration of blood to remove metabolic wastes
C. Ingestion and propulsion of food
D. Chemical digestion of macromolecules
Correct Answer: B
Rationale: The digestive system processes food for nutrient intake and waste elimination, but it is
not the primary system responsible for filtering metabolic wastes from the blood; that is the role
of the urinary system.
Q7: The innermost lining of the digestive tract, the mucosa, is composed of which three sub-
layers?
A. Epithelium, lamina propria, muscularis mucosae
B. Serosa, lamina propria, muscularis externa
C. Adventitia, muscularis externa, submucosa
D. Epithelium, submucosa, serosa
Correct Answer: A
Rationale: The mucosa is the innermost layer and consists of the epithelium (for
absorption/secretion), the lamina propria (loose connective tissue with blood/lymph vessels), and
the muscularis mucosae (thin smooth muscle for local movement).
Q8: Peristalsis and segmentation are two distinct muscular actions. What is the primary
difference between them?
A. Peristalsis occurs in the stomach, while segmentation only occurs in the small intestine.
B. Peristalsis propels food, while segmentation mixes food.
C. Peristalsis involves skeletal muscle, while segmentation involves smooth muscle.
D. Peristalsis is a chemical process, while segmentation is a mechanical process.
Correct Answer: B
BIOL252 Human Anatomy & Physiology II with Lab
Module 6 Exam Actual Exam 2026/2027 – Complete
Exam-Style Questions with Detailed Rationales | 100%
Verified – Pass Guaranteed – A+ Graded
Digestive System Overview & GI Tract Layers
Q1: Which of the following correctly lists the four primary processes of the digestive system in
the order they occur for a bite of food?
A. Ingestion, Digestion, Absorption, Defecation
B. Propulsion, Absorption, Secretion, Ingestion
C. Digestion, Ingestion, Absorption, Elimination
D. Ingestion, Secretion, Digestion, Propulsion
Correct Answer: A
Rationale: This choice is correct because it logically follows the path of food: taking it in
(ingestion), breaking it down (digestion), moving nutrients into the blood (absorption), and
removing waste (defecation).
Q2: A student is examining a slide of the digestive tract and identifies a layer containing dense
connective tissue, blood vessels, and the submucosal plexus. Which layer is she observing?
A. Mucosa
B. Submucosa
C. Muscularis externa
D. Serosa
Correct Answer: B
Rationale: The submucosa is the connective tissue layer found just beneath the mucosa that
houses the submucosal (Meissner’s) plexus, larger blood vessels, and lymphatic vessels.
Q3: Which anatomical modification of the stomach wall allows it to expand significantly during
a large meal?
,2
A. Rugae
B. Plicae circulares
C. Haustra
D. Teniae coli
Correct Answer: A
Rationale: Rugae are the thick folds or wrinkles in the stomach mucosa and submucosa that
allow the stomach to stretch and increase its volume to accommodate food intake.
Q4: The enteric nervous system regulates motility and secretion largely independently of the
CNS. Which plexus is responsible for regulating the muscularis externa to cause peristalsis?
A. Meissner's plexus
B. Auerbach's myenteric plexus
C. Celiac plexus
D. Hypogastric plexus
Correct Answer: B
Rationale: Auerbach's myenteric plexus is located between the circular and longitudinal muscle
layers of the muscularis externa and is primarily responsible for controlling GI tract motility,
including peristalsis.
Q5: During a dissection, an instructor points out the outermost layer of the esophagus, which is
composed of fibrous connective tissue rather than a smooth serosa. What is this specific layer
called?
A. Visceral peritoneum
B. Adventitia
C. Parietal peritoneum
D. Mesentery
Correct Answer: B
Rationale: The esophagus is an intraperitoneal organ in the thoracic cavity, so its outermost layer
is an adventitia (fibrous connective tissue) rather than a serous membrane (serosa), which is
found on intraperitoneal organs.
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Q6: Which of the following is NOT a function of the digestive system?
A. Mechanical breakdown of food
B. Filtration of blood to remove metabolic wastes
C. Ingestion and propulsion of food
D. Chemical digestion of macromolecules
Correct Answer: B
Rationale: The digestive system processes food for nutrient intake and waste elimination, but it is
not the primary system responsible for filtering metabolic wastes from the blood; that is the role
of the urinary system.
Q7: The innermost lining of the digestive tract, the mucosa, is composed of which three sub-
layers?
A. Epithelium, lamina propria, muscularis mucosae
B. Serosa, lamina propria, muscularis externa
C. Adventitia, muscularis externa, submucosa
D. Epithelium, submucosa, serosa
Correct Answer: A
Rationale: The mucosa is the innermost layer and consists of the epithelium (for
absorption/secretion), the lamina propria (loose connective tissue with blood/lymph vessels), and
the muscularis mucosae (thin smooth muscle for local movement).
Q8: Peristalsis and segmentation are two distinct muscular actions. What is the primary
difference between them?
A. Peristalsis occurs in the stomach, while segmentation only occurs in the small intestine.
B. Peristalsis propels food, while segmentation mixes food.
C. Peristalsis involves skeletal muscle, while segmentation involves smooth muscle.
D. Peristalsis is a chemical process, while segmentation is a mechanical process.
Correct Answer: B
