[RECALLS] PRELIMS - Topic 30: Gastric & Salivary Digestion (By: Dr. Ea Guiani) Flashcards
Monosaccharides
CHO
Amino acids
CHON
Monoacylglycerol
Fats
Fatty acids
Fats
Glycerol
Fats
Hormones that aid and regulate the digestive system:
a. gastrin
b. secretin
c. CCK
d. GIP
e. all of the above
f. a & b
e. all of the above
Water is greatly reabsorbed in which segment of the small and large intestine?
a. jejunum
b. ileum
c. duodenum
d. cecum
e. colon
a. jejunum
Saliva has a resting pH of 6.4 – 6.9, and an active pH of 7.0 – 7.3
a. true
b. false
a. true
Gland which produces a moderately viscous secretion and accounts for 70% content of saliva
a. gastric gland
b. parotid gland
c. submaxillary gland
d. sublingual gland
c. submaxillary gland
Produced by von Ebner’s glands
a. pancreatic lipase
b. salivary amylase
c. lingual lipase
d. gastric lipase
c. lingual lipase
Stimulates secretion of pepsinogen and HCl
Gastrin
Signals secretion of sodium bicarbonate and bile in the liver.
GIP
Signals release of digestive enzymes in pancreas
CCK
Induce insulin secretion and decreases stomach churning
GIP
Signals emptying of bile in gall baldder
CCK
Has an excitatory and inhibitory phase
Intestinal phase
Stimulates distention of the stomach, presence of food in stomach and increase in pH.
Gastric phase
Occurs before food enters the mouth
Cephalic phase
G cells release gastrin which stimulates parietal cells to release HCl
Gastric phase
Taste and smell stimulus is sent to the hypothalamus and medulla oblongata.
Cephalic phase
An endopeptidase secreted by the chief cells and activated by HCl.
a. pepsin
b. pepsinogen
c. Gastrin
d. Pancreatic lipase
b. pepsinogen
Secreted by the parietal cells
a. secretin
b. Pepsin
c. HCl
d. pepsinogen
c. HCl
Important in neonates with milk as substrate.
a. pancreatic lipase
b. salivary amylase
c. gastric lipase
d. ptyalin
c. gastric lipase
Hydrochloric acid digestion barrier.
a. mucin
b. HCO3
c. tight junction between cells
d. all of the above
d. all of the above
Parietal cells of the stomach also secrete a glycoprotein called intrinsic factor which enables the absorption of:
a. vitamin D
b. vitamin K
c. Vitamin B12
d. Vitamin C
c. Vitamin B12
Functions of bile:
a. emulsification
b. neutralization of acids
c. lowers surface tension
d. all of the above
d. all of the above
Cholesterol and phosphatidylcholine are dissolved by bile salts in the form of:
a. micelles
b. measles
c. missiles
d. misses
a. micelles
Most alkaline secretion of the human body stimulated by secretin, acetylcholine, and pancreozymin
a. gastric juice
b. salivary amylase
c. pancreatic lipase
d. pancreatic juice
d. pancreatic juice
Amylase catalyzes the hydrolysis of starches acting on alpha 1-4 glycosidic bond
a. true
b. false
a. true
Spared, not hydrolyzed linkages by amylase except:
a. alpha 1-4 glycosidic link
b. alpha 1:6 linkages
c. terminal 1:4 linkages
d. alpha 1:4 linkages next to the branching points
a. alpha 1-4 glycosidic link
Glucose
A. SLGT
B. GLUT 5
C. Both
C. Both
Galactose
A. SLGT
B. GLUT 5
C. Both
C. Both
Fructose:
A. SLGT
B. GLUT 5
C. Both
B. Glut 5
Sugar alcohols
A. SLGT
B. GLUT 5
C. Both
B. Glut 5
Principal end products of carbohydrate digestion in the intestinal lumen
a. alpha-limit dextrin
b. maltotriose
c. Maltose, lactose, sucrose
d. All of the above
d. All of the above
Major dietary lipids
a. triacylglycerol
b. triglycerides
c. phospholipids
d. all of the above
d. all of the above
Digestion of nucleic acids: ribonuclease and deoxyribonuclease:
a. true
b. false
a. true
Completes the digestion of amino acid:
a. dipeptidases
b. aminopeptidases
c. none of the above
a. dipeptidases
This mineral requires vitamin D for absorption, enhances permeability of mucosal cells and induces synthesis of calbindin:
a. calcium
b. iron
c. biotin
d. zinc
a. calcium
This vitamin is enhanced by vitamin C and alcohol. It accumulates in the mucosal cells bound to ferritin, but goes out of the mucosal cells via
transport protein ferropotin.
a. calcium
b. iron
c. biotin
d. zinc
b. iron
