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Chap 40

Week 13 Digestion & Absorption

QuestionAnswer
Which of the processes of mechanical digestion involves the esophagus? Deglutition Peristalsis Deglutition Peristalsis=Both A and B
Which of the following is not true of enzymes? They change chemically and are in the end products of the reaction.
The hormone thought to be a messenger causing release of digestive enzymes from the intestinal mucosa is: vasoactive intestinal peptide.
The enzyme pepsin begins the digestion of: protein.
The hormone that stimulates the release of bicarbonate substance from the pancreas is: secretin.
The hormone that inhibits gastric muscle, slowing passage of food into the duodenum, is called: gastric inhibitory peptide.
The sodium cotransport or coupled transport acts to transport sodium ions and glucose molecules _____ the GI lumen. passively out of
The intestinal hormone cholecystokinin: causes the pancreas to increase exocrine secretions high in enzyme content. opposes the influence of gastrin on gastric parietal cells. stimulates the contraction of the gallbladder. ALL ABOVE DOES ALL ABOVE
The enterogastric reflex causes: inhibition of gastric peristalsis.
Which of the following is a disaccharide? Sucrose
The process of swallowing is known as: deglutition.
Polysaccharides are hydrolyzed into disaccharides by enzymes known as: amylase.
The final product of carbohydrate digestion is a: monosaccharide.
Hydrolysis refers to: using water to split larger compounds into smaller ones.
Which phase(s) of gastric secretion is(are) stimulated by the sight, taste, and smell of food? Cephalic phase
When classified according to the kind of chemical reactions catalyzed, digestive enzymes are referred to as _____ enzymes. hydrolyzing
Which blood vessel carries absorbed food from the GI tract to the liver? Portal vein
The substances absorbed into the lymph capillaries are: glycerol and fatty acids.
Cellulose is a residue of digestion that comes from: carbohydrates.
The hormone that stimulates the gallbladder to release bile is: cholecystokinin.
Which step of deglutition is under voluntary control? Oral stage
An end product of fat digestion is: glycerol.
Rotavirus can cause what life-threatening condition in infants? Diarrhea
Which of these is not an example of mechanical digestion? Moistening the food
The process of fat emulsification consists of: breaking fats into small droplets.
Which of the following is not one of the openings that must be blocked when food moves from the pharynx into the esophagus? Oropharynx
The major site for the absorption of the end products of digestion is the: small intestine.
Bicarbonates are useful in the GI tract to: neutralize hydrochloric acid.
Glucose moves from the GI tract into the circulatory system by the process of: cotransport.
The purpose of peristalsis is to: propel food forward along the GI tract
Peristalsis is regulated in part by the intrinsic stretch reflexes. It is also thought to be stimulated by the hormone cholecystokinin (CCK)
During which stage of swallowing is there a risk of food entering respiratory pathways? Oropharyngeal
Because fats are insoluble in water, they must be emulsified.
The chemical process in which a compound unites with water and then splits into simpler compounds is called hydrolysis.
Chemical digestion requires the secretion of _____ into the lumen of the GI tract. digestive enzymes and bile
The wave-like ripple of the muscle layer of the GI tract is called peristalsis.
_____ is the passage of substances through the intestinal mucosa into the blood or lymph. Absorption
Stimulation of gastric juice secretion occurs in all of the following phases except the _____ phase. digestive
The act of expelling feces is called defecation.
The ejection of bile from the gallbladder is controlled by which hormones? CCK and secretin
The process of deglutition includes all of the following except the _____ stage. laryngeal
The final step in lipid transport by the intestines is the formation of chylomicrons.
Pepsinogen is converted to pepsin by hydrochloric acid, which is produced by the _____ of the gastric glands. parietal cells
Fats and other nutrients in the duodenum stimulate the intestinal mucosa to release a hormone called gastric inhibitory peptide.
CCK is an intestinal hormone that causes da pancreas to increase secretion of exocrine high in enzymatic content opposes da influence of gastrin on gastric parietal cells. stimulates contraction of da gallbladder so that bile can pass into the duodenum ALL OF THE ABOVE
What percentage of this blood flow comes from the hepatic portal system? 80%
Saliva contains the enzyme amylase.
Created by: Crystal C
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