BPK 105 FINAL STUDY EXAM
QUESTIONS AND VERIFIED
CORRECT ANSWERS
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GUARANTEED PASS
The enteric plexus becomes stimulated by preganglionic neurons which stimulates secretory
cells in the stomach to release:
Hydrochloric acid
Mucus
Intrinsic factor
Gastrin
Histamine
All released by parietal and chief cells
Describe the intestinal phase of stomach secretion. Describe the hormones and pathways
involved in modifying gastric activity - CORRECT ANSWER-Inhibits gastric secretions and is
controlled by the entrance of acidic chyme into the duodenum
When pH of chyme drops below 2.0 the inhibitory effect of the intestinal phase is greatest
,With low pH the hormone secretin is released to stop gastric secretions. Fatty acids and
peptides release cholecystokinin also inhibiting gastric secretions.
Negative feedback loop that raises pH
Compare and contrast the structure of the mucosal layers of the stomach and small intestine.
What does this tell you about the roles of the stomach and small intestine within the digestive
system? Provide a brief description of two specialized structures from each organ's mucosal
layer to support your discussion of its role. - CORRECT ANSWER-Surface mucosal cells of the
stomach:
Inner surface of the stomach and lining of the gastric pits
Produce mucous
Chief cells of the stomach:
secrete pepsinogen which is a precursor for pepsin
Mucosa cells of the small intestine: Absorptive cells that produce digestive enzymes and absorb
digested food.
Epithelial cells of the Small intestine: Secretes peptidases and disaccharidases
The Small intestine and stomach play a key role in digesting foods to their most basic
components and preparing them for more extensive absorption
, Describe the control of release and function of each of the secretions from the exocrine
pancreas. - CORRECT ANSWER-Bicarbonate Ions:
- Neutralize chyme from the stomach and allows pancreatic enzymes to function
- Released by the presence of chyme in the duodenum
Proteolytic Enzymes:
- Includes trypsin, chymotrypsin and carboxypeptidase and all continue protein digestion started
in the stomach
- Release triggered by cholecystokinin
Pancreatic Amylase:
- Continues polysaccharide digestion
- Release triggered by cholecystokinin
Lipase:
- Digests lipids
- Release triggered by cholecystokinin
Nuclease:
- Degrades DNA and RNA to
nucleotides
- Release triggered by cholecystokinin
Parasympathetic stimulation causes further stimulation through the vagus nerve leading to
more pancreatic enzyme release
QUESTIONS AND VERIFIED
CORRECT ANSWERS
GRADED A+ LATEST 100%
GUARANTEED PASS
The enteric plexus becomes stimulated by preganglionic neurons which stimulates secretory
cells in the stomach to release:
Hydrochloric acid
Mucus
Intrinsic factor
Gastrin
Histamine
All released by parietal and chief cells
Describe the intestinal phase of stomach secretion. Describe the hormones and pathways
involved in modifying gastric activity - CORRECT ANSWER-Inhibits gastric secretions and is
controlled by the entrance of acidic chyme into the duodenum
When pH of chyme drops below 2.0 the inhibitory effect of the intestinal phase is greatest
,With low pH the hormone secretin is released to stop gastric secretions. Fatty acids and
peptides release cholecystokinin also inhibiting gastric secretions.
Negative feedback loop that raises pH
Compare and contrast the structure of the mucosal layers of the stomach and small intestine.
What does this tell you about the roles of the stomach and small intestine within the digestive
system? Provide a brief description of two specialized structures from each organ's mucosal
layer to support your discussion of its role. - CORRECT ANSWER-Surface mucosal cells of the
stomach:
Inner surface of the stomach and lining of the gastric pits
Produce mucous
Chief cells of the stomach:
secrete pepsinogen which is a precursor for pepsin
Mucosa cells of the small intestine: Absorptive cells that produce digestive enzymes and absorb
digested food.
Epithelial cells of the Small intestine: Secretes peptidases and disaccharidases
The Small intestine and stomach play a key role in digesting foods to their most basic
components and preparing them for more extensive absorption
, Describe the control of release and function of each of the secretions from the exocrine
pancreas. - CORRECT ANSWER-Bicarbonate Ions:
- Neutralize chyme from the stomach and allows pancreatic enzymes to function
- Released by the presence of chyme in the duodenum
Proteolytic Enzymes:
- Includes trypsin, chymotrypsin and carboxypeptidase and all continue protein digestion started
in the stomach
- Release triggered by cholecystokinin
Pancreatic Amylase:
- Continues polysaccharide digestion
- Release triggered by cholecystokinin
Lipase:
- Digests lipids
- Release triggered by cholecystokinin
Nuclease:
- Degrades DNA and RNA to
nucleotides
- Release triggered by cholecystokinin
Parasympathetic stimulation causes further stimulation through the vagus nerve leading to
more pancreatic enzyme release
