PNB 2265 exam 3 Questions and
Answers with Rationales, A+ Guarantee
2026
Integrated meal response - Correct Answers ✅path of food
from mouth to rectum
Integrated meal response phases - Correct Answers
✅cephalic
gastric
intestinal
colonic
Two parts of GI tract - Correct Answers ✅alimentary canal
accessory organs
Alimentary canal - Correct Answers ✅mouth
esophagus
stomach
small intestines
large intestines
rectum
Accessory organs of GI trac - Correct Answers ✅salivary
glands
liver
pancreas
,PNB 2265 exam 3 Questions and
Answers with Rationales, A+ Guarantee
2026
gallbladder
Peritoneum - Correct Answers ✅serous membrane that
surrounds GI system that is different from others bc it folds in
on itself and btwn the folds are fat deposits
-made of parietal and visceral with peritoneal fluid between
Parietal peritoneum - Correct Answers ✅layer of serous
membrane that lines the walls of the abdominal cavity
Visceral peritoneum - Correct Answers ✅layer of serous
membrane that covers the surface of organs
Order of tissue layers in GI tract (wall to lumen) - Correct
Answers ✅serosa
muscularis
submucosa
mucosa
Serosa - Correct Answers ✅outer layer of tube that is
connective tissue wrapper that holds things together,
protects them, and is site of attachment
,PNB 2265 exam 3 Questions and
Answers with Rationales, A+ Guarantee
2026
Muscularis externa - Correct Answers ✅smooth muscle
layer that has two layers, one longitudinal outer layer and
one circular inner layer with a myenteric plexis layer btwn
Muscularis externa layers (lumen to outer) - Correct
Answers ✅circular layer
myenteric plexis
Longitudinal layer
Myenteric plexis - Correct Answers ✅nerve tissue layer
btwn the layers of the muscularis externa that controls
smooth muscle contraction and is under involuntary control
by parasympathetic stimulation
Longitudinal layer muscularis externa - Correct Answers
✅outer layer that gives you contractions that will make the
tube shorter or longer (controls length)
Circular layer muscularis externa - Correct Answers ✅inner
layer that controls radius of the tube
Submucosa - Correct Answers ✅loose connective tissue
that binds things together. Has large blood vessels, large
lymphatic vessels (galt), and nerves
, PNB 2265 exam 3 Questions and
Answers with Rationales, A+ Guarantee
2026
Galt - Correct Answers ✅submucosa (gut) associated
lymphatic tissue that has a lot of immune cells since this is a
point of entry for pathogens
Mucosa layers - Correct Answers ✅muscularis mucosae
lamino propria
epithelium layer
Muscularis mucosae - Correct Answers ✅mucosa layer that
is the muscle part that shapes the surface of the mucosal
layer
Lamina propria - Correct Answers ✅connective tissue
mucosal layer with tiny vessels (capillaries) and small
lymphatic vessels
Epithelium layer (mucosa) - Correct Answers ✅mucosa
layer closest to lumen that has specializations depending on
where in the GI tract
-has enterocytes, enteroendocrine cells, and mucin-producing
cells
Submucosal plexus - Correct Answers ✅nerves in the
submucosa layer
Answers with Rationales, A+ Guarantee
2026
Integrated meal response - Correct Answers ✅path of food
from mouth to rectum
Integrated meal response phases - Correct Answers
✅cephalic
gastric
intestinal
colonic
Two parts of GI tract - Correct Answers ✅alimentary canal
accessory organs
Alimentary canal - Correct Answers ✅mouth
esophagus
stomach
small intestines
large intestines
rectum
Accessory organs of GI trac - Correct Answers ✅salivary
glands
liver
pancreas
,PNB 2265 exam 3 Questions and
Answers with Rationales, A+ Guarantee
2026
gallbladder
Peritoneum - Correct Answers ✅serous membrane that
surrounds GI system that is different from others bc it folds in
on itself and btwn the folds are fat deposits
-made of parietal and visceral with peritoneal fluid between
Parietal peritoneum - Correct Answers ✅layer of serous
membrane that lines the walls of the abdominal cavity
Visceral peritoneum - Correct Answers ✅layer of serous
membrane that covers the surface of organs
Order of tissue layers in GI tract (wall to lumen) - Correct
Answers ✅serosa
muscularis
submucosa
mucosa
Serosa - Correct Answers ✅outer layer of tube that is
connective tissue wrapper that holds things together,
protects them, and is site of attachment
,PNB 2265 exam 3 Questions and
Answers with Rationales, A+ Guarantee
2026
Muscularis externa - Correct Answers ✅smooth muscle
layer that has two layers, one longitudinal outer layer and
one circular inner layer with a myenteric plexis layer btwn
Muscularis externa layers (lumen to outer) - Correct
Answers ✅circular layer
myenteric plexis
Longitudinal layer
Myenteric plexis - Correct Answers ✅nerve tissue layer
btwn the layers of the muscularis externa that controls
smooth muscle contraction and is under involuntary control
by parasympathetic stimulation
Longitudinal layer muscularis externa - Correct Answers
✅outer layer that gives you contractions that will make the
tube shorter or longer (controls length)
Circular layer muscularis externa - Correct Answers ✅inner
layer that controls radius of the tube
Submucosa - Correct Answers ✅loose connective tissue
that binds things together. Has large blood vessels, large
lymphatic vessels (galt), and nerves
, PNB 2265 exam 3 Questions and
Answers with Rationales, A+ Guarantee
2026
Galt - Correct Answers ✅submucosa (gut) associated
lymphatic tissue that has a lot of immune cells since this is a
point of entry for pathogens
Mucosa layers - Correct Answers ✅muscularis mucosae
lamino propria
epithelium layer
Muscularis mucosae - Correct Answers ✅mucosa layer that
is the muscle part that shapes the surface of the mucosal
layer
Lamina propria - Correct Answers ✅connective tissue
mucosal layer with tiny vessels (capillaries) and small
lymphatic vessels
Epithelium layer (mucosa) - Correct Answers ✅mucosa
layer closest to lumen that has specializations depending on
where in the GI tract
-has enterocytes, enteroendocrine cells, and mucin-producing
cells
Submucosal plexus - Correct Answers ✅nerves in the
submucosa layer
