APHY 201 Module 13 Digestive System Part 2 Ivy Tech Questions with
Correct Answers
Question 1:
by HCl; Enzymatic digestion of proteins by pepsin; Lipid-soluble alcohol and aspirin absorbed
into blood; Secretes intrinsic factor for vitamin B12 absorption.
chyme intestine
Answer:
Digestive processes in stomach
the watery, semidigested tiny pieces into which the bolus (food) is converted in the stomach
and
Question 2:
Only stomach function essential to life is secretion of
Answer:
intrinsic factor
Question 3:
Made in the parietal cells. B12 needed to produce mature red blood cells. Lack of intrinsic
factor causes pernicious anemia and must be treated with B12 injections.
hydrochloric acid pepsin
no longer effective. zymogen
Answer:
for vitamin B12 absorption.
denatures proteins in the stomach lumen to prepare them for digestion and kills bacteria that
enter the stomach. It converts the inactive enzyme pepsinogen into the active enzyme pepsin,
which is responsible for digesting proteins in your stomach. Ultimately, it is neutralized by
bicarbonate secreted into the duodenum once the chyme passes through the pyloric sphincter.
an enzyme that breaks down proteins into smaller peptides (that is, a protease). It is produced
in the stomach by the chief cells. The digestive power of pepsin is greatest at the acidity of
normal gastric juice (pH 1.5-2.5). In the intestine the gastric acids are neutralized (pH 7), and
pepsin is
Question 4:
Digestive proteases are released in inactive forms called. This is necessary to prevent protease
an enzyme that breaks down proteins and peptides. gastric lipase
Answer:
an inactive substance that is converted into an enzyme when activated by another enzyme.
the digestive enzymes from digesting the cells that produce them. In this form, part of the
protein blocks the active site of the enzyme. Cleaving off this peptide activates the enzyme.
, Question 5:
What are the modifications to the layers of the stomach?
Answer:
an enzyme produced by chief cells in stomach to digest triglycerides
Muscularis externa modified to have three layers of smooth muscle (oblique, circular, and
longitudinal). The inner oblique layer allows stomach to churn, mix, move, and physically break
Question 6:
Mucosa is modified with simple columnar epithelium composed of mucous cells that secrete
juice (2-3L per day) which consists mainly of water, HCl and pepsin.
Answer:
down food.
two-layer coat of alkaline mucus. The surface layer traps bicarbonate-rich fluid beneath it for
protection from acid. Mucosa also dotted with gastric pits (depressed areas) that produce
gastric
Question 7:
Due to harsh digestive conditions in stomach, this is produced to protect. Consists of a thick
(surface cells replaced every 3-6 days).
Answer:
mucosal barrier
layer of bicarbonate-rich mucus, tight junctions between epithelial cells to prevent juice
seeping underneath tissue, and damaged epithelial cells quickly replaced by division of stem
cells
Question 8:
Produce gastric juice up to 3 L gastric juice/day from parietal cell secretions of hydrochloric acid
Answer:
gastric glands
Question 9:
(HCl) and intrinsic factor, and chief cell secretions of pepsinogen enzyme and gastric lipases.
parietal cells
Answer:
inactive protein-digesting
produce hydrochloric acid (HCl) with a pH 1.5-3.5 to denature protein, activate pepsin, break
Correct Answers
Question 1:
by HCl; Enzymatic digestion of proteins by pepsin; Lipid-soluble alcohol and aspirin absorbed
into blood; Secretes intrinsic factor for vitamin B12 absorption.
chyme intestine
Answer:
Digestive processes in stomach
the watery, semidigested tiny pieces into which the bolus (food) is converted in the stomach
and
Question 2:
Only stomach function essential to life is secretion of
Answer:
intrinsic factor
Question 3:
Made in the parietal cells. B12 needed to produce mature red blood cells. Lack of intrinsic
factor causes pernicious anemia and must be treated with B12 injections.
hydrochloric acid pepsin
no longer effective. zymogen
Answer:
for vitamin B12 absorption.
denatures proteins in the stomach lumen to prepare them for digestion and kills bacteria that
enter the stomach. It converts the inactive enzyme pepsinogen into the active enzyme pepsin,
which is responsible for digesting proteins in your stomach. Ultimately, it is neutralized by
bicarbonate secreted into the duodenum once the chyme passes through the pyloric sphincter.
an enzyme that breaks down proteins into smaller peptides (that is, a protease). It is produced
in the stomach by the chief cells. The digestive power of pepsin is greatest at the acidity of
normal gastric juice (pH 1.5-2.5). In the intestine the gastric acids are neutralized (pH 7), and
pepsin is
Question 4:
Digestive proteases are released in inactive forms called. This is necessary to prevent protease
an enzyme that breaks down proteins and peptides. gastric lipase
Answer:
an inactive substance that is converted into an enzyme when activated by another enzyme.
the digestive enzymes from digesting the cells that produce them. In this form, part of the
protein blocks the active site of the enzyme. Cleaving off this peptide activates the enzyme.
, Question 5:
What are the modifications to the layers of the stomach?
Answer:
an enzyme produced by chief cells in stomach to digest triglycerides
Muscularis externa modified to have three layers of smooth muscle (oblique, circular, and
longitudinal). The inner oblique layer allows stomach to churn, mix, move, and physically break
Question 6:
Mucosa is modified with simple columnar epithelium composed of mucous cells that secrete
juice (2-3L per day) which consists mainly of water, HCl and pepsin.
Answer:
down food.
two-layer coat of alkaline mucus. The surface layer traps bicarbonate-rich fluid beneath it for
protection from acid. Mucosa also dotted with gastric pits (depressed areas) that produce
gastric
Question 7:
Due to harsh digestive conditions in stomach, this is produced to protect. Consists of a thick
(surface cells replaced every 3-6 days).
Answer:
mucosal barrier
layer of bicarbonate-rich mucus, tight junctions between epithelial cells to prevent juice
seeping underneath tissue, and damaged epithelial cells quickly replaced by division of stem
cells
Question 8:
Produce gastric juice up to 3 L gastric juice/day from parietal cell secretions of hydrochloric acid
Answer:
gastric glands
Question 9:
(HCl) and intrinsic factor, and chief cell secretions of pepsinogen enzyme and gastric lipases.
parietal cells
Answer:
inactive protein-digesting
produce hydrochloric acid (HCl) with a pH 1.5-3.5 to denature protein, activate pepsin, break
