BIOL 252 MODULE 6 200 QUESTION EXAM PREP PACK MULTIPLE CHOICE AND RATIONALES PORTAGE LEARNING AND NURSING STANDARD

BIOL 252 MODULE 6 200 QUESTION
EXAM PREP PACK MULTIPLE CHOICE
AND RATIONALES PORTAGE LEARNING
AND NURSING STANDARD


BIOL 252: Human Anatomy & Physiology II – Module 6 Exam
1. Which layer of the alimentary canal is responsible for the direct
absorption of nutrients into the bloodstream and lymphatic
vessels?
A. Serosa
B. Muscularis externa
C. Mucosa
D. Submucosa
Answer: C. Mucosa
Rationale: The mucosa is the innermost layer consisting
of epithelium, lamina propria, and muscularis mucosae;
it serves as the primary site for nutrient absorption and
secretion of mucus and enzymes.
2. Which structure is a fold of the peritoneum that attaches the liver
to the anterior abdominal wall and the diaphragm?
A. Lesser omentum
B. Falciform ligament
C. Mesentery proper
D. Greater omentum
Answer: B. Falciform ligament
Rationale: The falciform ligament is a serous membrane
fold that stabilizes the liver's position within the
abdominal cavity by anchoring it to the ventral body wall.
3. During the process of deglutition, which structure effectively
prevents a bolus of food from entering the nasopharynx?
A. Epiglottis
B. Uvula
C. Soft palate
D. Lingual frenulum
Answer: C. Soft palate

, Rationale: During swallowing, the soft palate and uvula
move superiorly to close off the nasopharynx, ensuring
food enters the oropharynx instead of the nasal cavity.
4. Which cells within the gastric glands are responsible for the
secretion of intrinsic factor and hydrochloric acid (HCl)?
A. Chief cells
B. G cells
C. Mucous neck cells
D. Parietal cells
Answer: D. Parietal cells
Rationale: Parietal cells produce HCl to activate
pepsinogen and intrinsic factor, which is essential for the
absorption of vitamin B12 in the ileum.
5. What is the primary function of the hormone Cholecystokinin
(CCK) when released from the enteroendocrine cells of the
duodenum?
A. Stimulates the release of alkaline pancreatic juice
B. Triggers gallbladder contraction and the release of pancreatic
enzymes
C. Inhibits gastric motility and secretion
D. Stimulates the parietal cells to produce more HCl
Answer: B. Triggers gallbladder contraction and the release of
pancreatic enzymes
Rationale: CCK is released in response to fats and
proteins entering the duodenum, signaling the
gallbladder to expel bile and the pancreas to release
digestive enzymes.
6. Which region of the small intestine is the shortest and receives
chyme from the stomach along with secretions from the liver and
pancreas?
A. Ileum
B. Jejunum
C. Duodenum
D. Cecum
Answer: C. Duodenum
Rationale: The duodenum is the first C-shaped segment
of the small intestine where the majority of chemical
digestion occurs due to the influx of bile and pancreatic
juices.

,7. The "milky" appearance of lymph within the lacteals of the small
intestine after a meal is due to the presence of:
A. Micelles
B. Chylomicrons
C. Fatty acids
D. Amino acids
Answer: B. Chylomicrons
Rationale: Absorbed lipids are reassembled into
triglycerides and packaged with proteins to form
chylomicrons, which enter the lacteals rather than blood
capillaries.
8. Which of the following is an exocrine product of the pancreas
specifically designed to neutralize acidic chyme?
A. Insulin
B. Sodium bicarbonate
C. Trypsinogen
D. Glucagon
Answer: B. Sodium bicarbonate
Rationale: The duct cells of the pancreas secrete a
bicarbonate-rich fluid that raises the pH of chyme,
protecting the intestinal mucosa and providing an
optimal environment for enzymes.
9. Peristalsis in the digestive tract is primarily controlled by which
layer of the alimentary canal?
A. Mucosa
B. Submucosa
C. Muscularis externa
D. Serosa
Answer: C. Muscularis externa
Rationale: The muscularis externa consists of circular
and longitudinal smooth muscle layers that contract
rhythmically to propel food (peristalsis) and mix it
(segmentation).
10. Which enzyme is responsible for the initial chemical
breakdown of dietary starches within the oral cavity?
A. Lingual lipase
B. Salivary amylase
C. Pepsin
D. Pancreatic amylase

, Answer: B. Salivary amylase
Rationale: Salivary amylase begins the hydrolysis of
complex carbohydrates into smaller polysaccharides and
disaccharides as soon as food is mixed with saliva.
11. Which structure in the small intestine is responsible for increasing
surface area to maximize the absorption of nutrients?
A. Peyer’s patches
B. Haustra
C. Villi
D. Rugae
Answer: C. Villi
Rationale: Villi are finger-like projections of the mucosa that
significantly increase the surface area available for absorption
and contain a capillary bed and a lacteal.
12. Which enzyme is responsible for the activation of trypsinogen into
its active form, trypsin, within the duodenum?
A. Pepsin
B. Enteropeptidase
C. Amylase
D. Chymotrypsin
Answer: B. Enteropeptidase
Rationale: Enteropeptidase is a brush border enzyme that
triggers the activation of pancreatic proteases to prevent the
pancreas from digesting itself.
13. The primary role of bile salts in the digestive process is to:
A. Chemically digest proteins into amino acids
B. Emulsify large lipid droplets into smaller micelles
C. Hydrolyze carbohydrates into monosaccharides
D. Lower the pH of the stomach contents
Answer: B. Emulsify large lipid droplets into smaller micelles
Rationale: Bile salts act as detergents that break down large
fat globules, increasing the surface area for lipase enzymes to
work efficiently.
14. Which specific region of the stomach is located closest to the
junction where the esophagus enters?
A. Fundus
B. Pylorus
C. Cardia