AP2 – Chap 23 – Flashcards
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In order to prevent self-digestion of the pancreas, activation of pancreatic proteases occurs in the __________.
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duodenum
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During deglutition, the bolus passes into the stomach from the esophagus through the __________.
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gastroesophageal sphincter
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A loose gastroesophageal sphincter can cause:
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heartburn or acid reflux
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During the intestinal phase of gastric regulation, the stomach is __________.
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initially stimulated and later inhibited
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Protective collections of lymphocytes and macrophages are found in __________.
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Peyer's patches
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contain lymphocytes and macrophages, increase in number toward the end of the ileum
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Peyer's patches
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What is the main organic molecule digested in the stomach?
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Proteins
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The only enzyme produced by the stomach is _________, which does what?
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pepsin, which digests protein
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The propulsive function that occurs in the esophagus is called __________.
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peristalsis
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Main characteristic of the large intestine:
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The large intestine contains a large number of bacteria. E. coli is the primary bacterial species in the colon.
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Which regulatory chemical stimulates gastric gland activity and motility?
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Gastrin
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Both the stomach and the small intestine produce this chemical:
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Gastrin
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Gastrin is a major stomach hormone or enzyme?
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Hormone
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What substances from different organs would mix together at the hepatopancreatic ampulla?
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Bile and pancreatic enzymes mix at the hepatopancreatic ampulla.
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What would be the effect of stripping the small intestines of their villi?
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Decreased surface area for absorption would cause weight loss to occur.
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Decreased intestinal surface area would lead to what type of health problems?
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malnutrition, dehydration, diarrhea, and electrolyte imbalance
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What are the products of the stomach?
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HCl, IF, mucous, and pepsinogen (pepsin) are products of the stomach.
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The final product of carbohydrate digestion is __________.
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monosaccharides
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All macromolecules are broken down to their monomers, except __________.
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fatty acids
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What cells produce HCl and Intrinsic Factor?
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Parietal Cells
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What cells produce pepsinogen?
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Chief cells
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Chief cells are what type of cell?
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enzyme-producing cells.
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The digestive system in a cadaver is longer than in a living person because, in a cadaver, there is NO __________.
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muscle tone
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__________ is the major means of propulsion in the digestive system.
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Peristalsis
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the short reflexes in the digestive system are stimulated by __________.
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the enteric nerve plexuses
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What is the most common cause of peritonitis?
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a burst appendix
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The myxovirus causes __________.
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mumps
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The only stomach function that is essential to life is __________.
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the secretion of intrinsic factor
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Some aspects of the __________ phase of gastric secretion may be considered conditioned reflexes.
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cephalic phase
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Which of the following intestinal hormones is NOT an enterogastrone?
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gastrin
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Hollow muscular organs, like the stomach, that act as reservoirs exhibit __________.
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plasticity
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Many of the early food allergies seen in infants are caused by __________.
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absorption of whole proteins
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Which of the following is a condition that affects the large intestine that is NOT explained by anatomical or biochemical abnormalities?
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irritable bowel syndrome
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A hiatal hernia is:
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anatomical abnormality of the diaphragm
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Omenta is the special name for:
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part of the mesentery
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holds the organs of the abdomen in place.
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mesentary
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The mesentary provides a route for:
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blood vessels, lymphatics, and nerves to reach the digestive viscera
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Which of the following is NOT an accessory organ of the digestive system?
salivary glands
teeth
tongue
intestines
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intestines
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The major site for nutrient absorption is the __________.
large intestine
small intestine
stomach
mouth
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small intestine
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The primary goal of digestive tract regulatory mechanisms is to optimize nutrient breakdown and absorption.
True
False
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True
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The serous membrane that covers the external surface of most digestive organs is called the __________.
mesentery
omentum
visceral peritoneum
parietal peritoneum
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visceral peritoneum
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__________ circulation collects nutrient-rich blood from the GI tract and delivers it to the liver.
Cardiac
Aortic
Peritoneal
Hepatic portal
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Hepatic portal
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main site of nutrient absorption
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mucosa layer
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protective outermost layer of the alimentary canal
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serosa
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moderately dense connective tissue that has a rich supply of blood, lymphatic vessels, and nerve fibers
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submucosa
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responsible for segmentation and peristalsis
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muscularis externa
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Saliva contains enzymes that break down proteins.
True
False
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False
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A weak gastroesophageal sphincter can result in heartburn.
true
false
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True
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Which of the following is NOT a function of the stomach?
The stomach chemically digests lipids.
The stomach produces intrinsic factor.
The stomach mechanically digests food.
The stomach serves as a temporary holding area for ingested food.
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The stomach chemically digests lipids.
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The phases of gastric secretion from first to last are __________.
gastric phase, cephalic phase, intestinal phase
intestinal phase, gastric phase, cephalic phase
cephalic phase, intestinal phase, gastric phase
cephalic phase, gastric phase, intestinal phase
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cephalic phase, gastric phase, intestinal phase
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The increased concentration of HCO3- in blood draining from the stomach is called __________.
the chloride shift
the gastric phase
the alkaline tide
the enterogastric reflex
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the alkaline tide
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Digestion of carbohydrates and proteins by brush border enzymes occurs within the ________ of the small intestine.
circular folds
villi
goblet cells
microvilli
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microvilli
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Bile is stored and concentrated in the __________.
stomach
liver
gallbladder
pancreas
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gallbladder
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Which of the following is NOT a characteristic of the liver?
It is highly regenerative.
It has a role in detoxifying the blood.
It has three lobes.
It stores glucose.
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It has three lobes. (the liver has 4 lobes)
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__________ is NOT found in pancreatic secretions.
Chymotrypsinogen
Bicarbonate
Procarboxypeptidase
Cholecystokinin (CCK)
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Cholecystokinin (CCK)
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Pancreatic juice contains
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water, enzymes, and electrolytes (mainly bicarbonate ions)
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Pancreatic enzymes include proteases to digest __________. What are the Pancreatic Protease Enyzmes?
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proteins (i.e., trypsinogen, chymotrypsinogen, procarboxypeptidase)
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Pancreatic enzymes include amylases to digest _________.
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carbohydrates
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Pancreatic enzymes include lipases to digest
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fats
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Pancreatic enzymes include nucleases to digest
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nucleic acids such as DNA and RNA
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Secretin and cholecystokinin (CCK) are released by which alimentary canal organ?
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the small intestine
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Most digestion occurs in the small intestine.
True
False
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True
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The liver can absorb nutrients.
True
False
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False -- The liver can STORE nutrients, but does not absorb nutrients from the GI tract into the blood.
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Most water is absorbed in the __________.
stomach
small intestine
liver
large intestine
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small intestine
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A main digestive function of the small intestine is to:
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absorb water
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Bacterial flora in the large intestine do NOT produce __________.
CO2
intrinsic factor
vitamin K
B vitamins
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Intrinsic Factor
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Diarrhea results when food passes too quickly through the large intestine.
True
False
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True
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Simplest form of lipids:
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fatty acids and monoglycerides
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Simplest form of proteins:
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amino acids
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Simplest form of carbohydrates:
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monosaccharides
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Simplest form of nucleic acids:
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nucleotides
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Pepsin enzymatically digests __________.
carbohydrate
nucleic acids
fat
protein
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Proteins
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Someone on a fat-free diet would not efficiently absorb vitamin D from their diet.
True
False
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True