PNB 2265 Exam III: Digestive System
Exam Questions and Answers (Latest
2026)
alimentary canal - Correct Answers ✅digestive tube that
extends from the mouth to the anus
-mouth
-esophagus
-stomach
-SI
-LI
-rectum
accessory organs - Correct Answers ✅-salivary glands
-liver
-pancreas
-gallbladder
Serous Peritoneum - Correct Answers ✅double layered
membrane SURROUNDING the abdominal cavity
-membrane will "fold" on themselves = pockets
1. parietal (inside) peritoneum = lines walls of abdominal
cavity
in between: peritoneal fluid = lubrication
,PNB 2265 Exam III: Digestive System
Exam Questions and Answers (Latest
2026)
2. visceral peritoneum (outside) = covers surface of organs
omentum - Correct Answers ✅a fold of peritoneum
connecting the stomach with other abdominal organs.
-belly region
-VISCERAL fat
GI Layers: Serosa - Correct Answers ✅ie. adventitia
-outermost layer
-CT layer but contains BV
-purpose: give structure, protection
GI layers: muscularis externa - Correct Answers ✅SMOOTH
MUSCLE layer, two sections:
1. outer layer = "longitudinal"
-length: slides things forward
-relax = lengthen
-contract = shorten
MYENTERIC PLEXUS (nerves)
-between the longitudinal and circular muscular layers,
innervates the submucosal plexus
, PNB 2265 Exam III: Digestive System
Exam Questions and Answers (Latest
2026)
-like a relay station, sends sensory info to the brainstem:
chemical, pH of gut, stretch of walls, motor responses
-part of enteric NS
-majority is parasympathetic (think "rest and digest"): ACh
-preganglionic nerves: vagus or pelvic
2. inner layer = "circular"
-radius, wraps around the tube: flow
-relax = inc radius
-contract = dec radius
GI layers: submucosa - Correct Answers ✅-loose CT tissue,
thick layer
-large BV
-Gut Associated Lymphatic Tissues (GALT): large LVs that
protect vs. bacteria
-submuscosal plexus: smaller nerves that are between the
circular layer and innervate the mucosal layer
GI layer: mucosa - Correct Answers ✅three sublayers:
1. muscularis mucosae
-smooth muscle
Exam Questions and Answers (Latest
2026)
alimentary canal - Correct Answers ✅digestive tube that
extends from the mouth to the anus
-mouth
-esophagus
-stomach
-SI
-LI
-rectum
accessory organs - Correct Answers ✅-salivary glands
-liver
-pancreas
-gallbladder
Serous Peritoneum - Correct Answers ✅double layered
membrane SURROUNDING the abdominal cavity
-membrane will "fold" on themselves = pockets
1. parietal (inside) peritoneum = lines walls of abdominal
cavity
in between: peritoneal fluid = lubrication
,PNB 2265 Exam III: Digestive System
Exam Questions and Answers (Latest
2026)
2. visceral peritoneum (outside) = covers surface of organs
omentum - Correct Answers ✅a fold of peritoneum
connecting the stomach with other abdominal organs.
-belly region
-VISCERAL fat
GI Layers: Serosa - Correct Answers ✅ie. adventitia
-outermost layer
-CT layer but contains BV
-purpose: give structure, protection
GI layers: muscularis externa - Correct Answers ✅SMOOTH
MUSCLE layer, two sections:
1. outer layer = "longitudinal"
-length: slides things forward
-relax = lengthen
-contract = shorten
MYENTERIC PLEXUS (nerves)
-between the longitudinal and circular muscular layers,
innervates the submucosal plexus
, PNB 2265 Exam III: Digestive System
Exam Questions and Answers (Latest
2026)
-like a relay station, sends sensory info to the brainstem:
chemical, pH of gut, stretch of walls, motor responses
-part of enteric NS
-majority is parasympathetic (think "rest and digest"): ACh
-preganglionic nerves: vagus or pelvic
2. inner layer = "circular"
-radius, wraps around the tube: flow
-relax = inc radius
-contract = dec radius
GI layers: submucosa - Correct Answers ✅-loose CT tissue,
thick layer
-large BV
-Gut Associated Lymphatic Tissues (GALT): large LVs that
protect vs. bacteria
-submuscosal plexus: smaller nerves that are between the
circular layer and innervate the mucosal layer
GI layer: mucosa - Correct Answers ✅three sublayers:
1. muscularis mucosae
-smooth muscle
