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Phys week 13 - Digst

Ch 40 - Digestion and Absorption

The process of deglutition includes all of the following except the _____ stage. laryngeal
The wave-like ripple of the muscle layer of the GI tract is called peristalsis
The chemical process in which a compound unites with water and then splits into simpler compounds is called hydrolysis
Because fats are insoluble in water, they must be emulsified
Stimulation of gastric juice secretion occurs in all of the following phases except the _____ phase. digestive
Peristalsis is regulated in part by the intrinsic stretch reflexes. It is also thought to be stimulated by the hormone cholecystokinin (CCK)
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
Chemical digestion requires the secretion of _____ into the lumen of the GI tract. digestive enzymes and bile
CCK is an intestinal hormone that a. causes the pancreas to increase secretion of exocrine high in enzymatic content. b. opposes the influence of gastrin on gastric parietal cells. c. stimulates contraction of the gallbladder so that bile can pass into the duodenum. d. all of the above A
The act of expelling feces is called defecation
The ejection of bile from the gallbladder is controlled by which hormones? CCK and secretin
Saliva contains the enzyme amylase
Fats and other nutrients in the duodenum stimulate the intestinal mucosa to release a hormone called gastric inhibitory peptide.
_____ is the passage of substances through the intestinal mucosa into the blood or lymph. Absorption
At rest, about 1500 mL of blood per minute flow through the liver. What percentage of this blood flow comes from the hepatic portal system? 80%
Watch the following animation to see how swallowing is a complex process that involves the nervous system to coordinate the actions of upper respiratory and digestive activities. During which stage of swallowing is there a risk of food entering respirator Oropharyngeal
Which of the following is not a function of the liver? Secretion of insulin
The hormone that inhibits gastric muscle, slowing passage of food into the duodenum, is called: gastric inhibitory peptide.
The major site for the absorption of the end products of digestion is the: small intestine
The final product of carbohydrate digestion is a: monosaccharide
Glucose moves from the GI tract into the circulatory system by the process of: facilitated diffusion.
The enzyme pepsin begins the digestion of: protein
Hydrolysis refers to: using water to split larger compounds into smaller ones.
Bicarbonates are useful in the GI tract to: neutralize hydrochloric acid.
Which of the following is not true of enzymes? They change chemically and are in the end products of the reaction.
The sodium cotransport or coupled transport acts to transport sodium ions and glucose molecules _____ the GI lumen. passively out of
The enterogastric reflex causes: inhibition of gastric peristalsis.
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 hormone that stimulates the release of bicarbonate substance from the pancreas is: secretin
Which phase(s) of gastric secretion is(are) stimulated by the sight, taste, and smell of food? Cephalic phase
An end product of fat digestion is: glycerol
The process of swallowing is known as: deglutition
The process of fat emulsification consists of: breaking fats into small droplets.
The intestinal hormone cholecystokinin: a. causes the pancreas to increase exocrine secretions high in enzyme content. b. opposes the influence of gastrin on gastric parietal cells. c. stimulates the contraction of the gallbladder. d. does all of the above. Answer: all of the above
The hormone thought to be a messenger causing release of digestive enzymes from the intestinal mucosa is: vasoactive intestinal peptide.
When classified according to the kind of chemical reactions catalyzed, digestive enzymes are referred to as _____ enzymes. hydrolyzing
Cholecystokinin (CCK) Cholecystokinin (CCK) is a peptide hormone produced in the small intestine, specifically by the I cells in the mucosal lining of the duodenum and jejunum. It plays a crucial role in the digestive process and has several important functions.
Created by: prispeguero
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