BIOL 252 Human Anatomy & Physiology II
w/Lab Module 7 Exam: Digestive System
100 Questions with Correct Answers and
Expert Rationales
SECTION A: Overview of the Digestive System (Questions 1-
20)
1. The process of breaking down food into smaller molecules
for absorption is called:
A) Ingestion
B) Digestion
C) Absorption
D) Elimination
Correct Answer: B) Digestion
Expert Rationale: Digestion is the process of breaking down large
food molecules into smaller, absorbable units. Ingestion is taking
food into the mouth, absorption is the uptake of nutrients into the
bloodstream, and elimination is the removal of undigested waste .
2. The digestive system is responsible for all of the following
functions EXCEPT:
A) Ingestion
B) Mechanical and chemical digestion
,C) Regulation of blood glucose
D) Absorption of nutrients
Correct Answer: C) Regulation of blood glucose
Expert Rationale: While the digestive system supplies glucose, the
regulation of blood glucose is primarily a function of the endocrine
system (insulin and glucagon from the pancreas). The digestive
system performs ingestion, digestion, absorption, and elimination .
3. The visceral peritoneum is the layer that:
A) Lines the abdominal cavity wall
B) Covers the abdominal organs
C) Suspends the intestines
D) Is found only in the thoracic cavity
Correct Answer: B) Covers the abdominal organs
Expert Rationale: The visceral peritoneum is the serous membrane
that covers the external surfaces of most abdominal organs. The
parietal peritoneum lines the abdominal cavity wall. The mesentery
suspends the intestines .
4. Which layer of the alimentary canal is responsible for
peristalsis?
A) Mucosa
B) Submucosa
,C) Muscularis externa
D) Serosa
Correct Answer: C) Muscularis externa
Expert Rationale: The muscularis externa contains smooth muscle
layers (circular and longitudinal) responsible for peristalsis and
segmentation. The mucosa is involved in secretion and absorption,
the submucosa provides support and vascular supply, and the
serosa is the outermost protective layer .
5. The outermost layer of the alimentary canal is the:
A) Mucosa
B) Submucosa
C) Muscularis externa
D) Serosa (adventitia)
Correct Answer: D) Serosa (adventitia)
Expert Rationale: The serosa (visceral peritoneum) is the outermost
layer of the alimentary canal organs that are within the peritoneal
cavity. In areas where the organ is retroperitoneal, the outer layer
is called the adventitia .
6. Which part of the digestive tract is NOT considered part of
the alimentary canal?
A) Esophagus
B) Stomach
, C) Liver
D) Small intestine
Correct Answer: C) Liver
Expert Rationale: The liver is an accessory digestive organ, not part
of the alimentary canal (GI tract). The alimentary canal includes
the mouth, pharynx, esophagus, stomach, small intestine, large
intestine, and anus. Accessory organs include the liver, gallbladder,
and pancreas .
7. The mesentery is a double layer of peritoneum that:
A) Lines the abdominal cavity
B) Suspends and supports organs within the abdominal cavity
C) Covers the heart
D) Lines the thoracic cavity
Correct Answer: B) Suspends and supports organs within the
abdominal cavity
Expert Rationale: The mesentery is a double fold of peritoneum that
attaches organs to the posterior abdominal wall, providing support,
blood vessel pathways, and nerve supply. It also contains fat and
lymphatics .
8. Which of the following is an accessory organ of the
digestive system?
w/Lab Module 7 Exam: Digestive System
100 Questions with Correct Answers and
Expert Rationales
SECTION A: Overview of the Digestive System (Questions 1-
20)
1. The process of breaking down food into smaller molecules
for absorption is called:
A) Ingestion
B) Digestion
C) Absorption
D) Elimination
Correct Answer: B) Digestion
Expert Rationale: Digestion is the process of breaking down large
food molecules into smaller, absorbable units. Ingestion is taking
food into the mouth, absorption is the uptake of nutrients into the
bloodstream, and elimination is the removal of undigested waste .
2. The digestive system is responsible for all of the following
functions EXCEPT:
A) Ingestion
B) Mechanical and chemical digestion
,C) Regulation of blood glucose
D) Absorption of nutrients
Correct Answer: C) Regulation of blood glucose
Expert Rationale: While the digestive system supplies glucose, the
regulation of blood glucose is primarily a function of the endocrine
system (insulin and glucagon from the pancreas). The digestive
system performs ingestion, digestion, absorption, and elimination .
3. The visceral peritoneum is the layer that:
A) Lines the abdominal cavity wall
B) Covers the abdominal organs
C) Suspends the intestines
D) Is found only in the thoracic cavity
Correct Answer: B) Covers the abdominal organs
Expert Rationale: The visceral peritoneum is the serous membrane
that covers the external surfaces of most abdominal organs. The
parietal peritoneum lines the abdominal cavity wall. The mesentery
suspends the intestines .
4. Which layer of the alimentary canal is responsible for
peristalsis?
A) Mucosa
B) Submucosa
,C) Muscularis externa
D) Serosa
Correct Answer: C) Muscularis externa
Expert Rationale: The muscularis externa contains smooth muscle
layers (circular and longitudinal) responsible for peristalsis and
segmentation. The mucosa is involved in secretion and absorption,
the submucosa provides support and vascular supply, and the
serosa is the outermost protective layer .
5. The outermost layer of the alimentary canal is the:
A) Mucosa
B) Submucosa
C) Muscularis externa
D) Serosa (adventitia)
Correct Answer: D) Serosa (adventitia)
Expert Rationale: The serosa (visceral peritoneum) is the outermost
layer of the alimentary canal organs that are within the peritoneal
cavity. In areas where the organ is retroperitoneal, the outer layer
is called the adventitia .
6. Which part of the digestive tract is NOT considered part of
the alimentary canal?
A) Esophagus
B) Stomach
, C) Liver
D) Small intestine
Correct Answer: C) Liver
Expert Rationale: The liver is an accessory digestive organ, not part
of the alimentary canal (GI tract). The alimentary canal includes
the mouth, pharynx, esophagus, stomach, small intestine, large
intestine, and anus. Accessory organs include the liver, gallbladder,
and pancreas .
7. The mesentery is a double layer of peritoneum that:
A) Lines the abdominal cavity
B) Suspends and supports organs within the abdominal cavity
C) Covers the heart
D) Lines the thoracic cavity
Correct Answer: B) Suspends and supports organs within the
abdominal cavity
Expert Rationale: The mesentery is a double fold of peritoneum that
attaches organs to the posterior abdominal wall, providing support,
blood vessel pathways, and nerve supply. It also contains fat and
lymphatics .
8. Which of the following is an accessory organ of the
digestive system?
