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81 terms

BIO202 Exam3

Digestive system
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Each of the following organs is a component of the digestive tract, except the
bladder
Which of the following is an accessory organ of digestion?
pancreas
The lamina propria and mucous epithelium are components of the
mucosa
Contraction of the ________ alters the shape of the intestinal lumen and moves epithelial pleats and folds.
muscularis mucosa
The ________ are double sheets of peritoneal membrane that suspend the visceral organs and carry nerves, lymphatics, and blood vessels.
mesenteries
Which layer of the digestive tract has a dense irregular connective tissue that surrounds the muscularis mucosae?
submucosa
Large blood vessels and lymphatics are found in the
submucosa
Which of the following is not a function of the digestive system?
filtration
A structure that helps prevent food from entering the pharynx prematurely is the
uvula.
________ pair(s) of salivary glands secrete into the oral cavity.
Three
The roof of the oral cavity is formed by the
all of the above
The ridge of oral mucosa that surrounds the base of a tooth is the
gingiva
Carbohydrate digestion begins in the
mouth.
The functions of the oral cavity include all of the following, except
absorption of monosaccharides
Which of the following is a function of the tongue?
all of the above
The bulk of each tooth consists of a mineralized matrix similar to that of bone called
dentin.
The chamber within a tooth that contains blood vessels and nerves is the
pulp cavity.
The crown of a tooth is covered by
enamel.
________ are blade-shaped teeth that function in cutting or clipping.
Incisors
________ are pointed teeth that are adapted for tearing and slashing.
Cuspids
________ are teeth with flattened crowns and prominent ridges that are adapted for crushing and grinding.
Molars
________ are also known as canines.
Cuspids
Functions of teeth include
all of the above
________ crush and grind food.
Both bicuspids and molars
During deglutition,
all of the above
Muscles known as the pharyngeal constrictors function in
swallowing.
The ________ supports most of the small intestine and provides stability and limited movement.
mesentery proper
What provides access for blood vessels entering and leaving the liver?
lesser omentum
Which of the following contains adipose tissue and provides padding for the anterior and lateral portions of the abdomen?
greater omentum
The double-layer sheets of serous membrane that support the viscera are called
mesenteries.
Regions of the stomach include all of the following, except
ileum.
Which region of the stomach does the esophagus connect to?
cardia
The greater omentum is
a fatty sheet that hangs like an apron over the abdominal viscera
The part of the stomach that functions as a mixing chamber for food and secretions is the
body.
The region of the stomach that empties into the duodenum is the
pylorus
A feature of the digestive epithelium that assists expansion of the stomach is the presence of
rugae.
The ________ mechanically digests ingested food.
stomach
Parietal cells secrete
hydrochloric acid
Chief cells secrete
pepsinogen.
Gastric pits are
openings into gastric glands.
The enzyme pepsin digests
proteins.
An enzyme secreted by the gastric mucosa of a newborn that assists in the digestion of milk proteins is
rennin.
All of the following are true of the lining of the stomach, except that it
recycles bile.
Which of the following is greater?
the pH of the blood in gastric veins during digestion of a large meal
Mary had her stomach mostly removed to try to overcome obesity. As a result you would expect Mary to be at risk for
vitamin B12 deficiency.
Lacteals
carry absorbed fats to the lymphatic system.
Plicae and intestinal villi
increase the surface area of the mucosa of the small intestine.
Plicae circulares are
circumferential folds in the mucosa and submucosa of the small intestine.
Which of these enhance the absorptive effectiveness of the small intestine?
all of the above
Products of fat digestion are transported initially by
lacteals
Duodenal glands are characteristic of the
small intestine
The villi are most developed in the
jejunum.
The portion of the small intestine that attaches to the cecum is the
ileum
The part of the digestive tract that plays the primary role in the digestion and absorption of nutrients is the
jejunum.
An intestinal hormone that stimulates mucus secretion by the submucosal duodenal glands and dilation of intestinal capillaries is
vasoactive intestinal peptide (VIP)
The intestinal hormone that stimulates the pancreas to release a watery, bicarbonate-rich fluid is
secretin.
An intestinal hormone that stimulates contraction of the gallbladder to release bile is
cholecystokinin
An intestinal hormone that stimulates the release of insulin from the pancreatic islet cells is
gastric inhibitory peptide (GIP)
An intestinal hormone that stimulates gastric secretion is
gastrin
The hormone that stimulates secretion and contraction by the stomach is
gastrin.
Which of these descriptions best matches the term cholecystokinin (CCK)?
causes gall bladder to contract
In response to the hormone secretin, the pancreas secretes a fluid
rich in bicarbonate ion (buffers)
During the cephalic phase of gastric secretion,
there is an increased flow of action potentials along the vagus nerve to the stomach.
The gastric phase of gastric secretion is triggered by the
entry of food into the stomach
All of the following are true of the intestinal phase of gastric digestion, except that it
precedes the gastric phase
The secretion of acid and enzymes by the gastric mucosa is controlled and regulated by
all of the above
Which organ is responsible for dehydration and compaction of indigestible materials?
large intestine
At the left colic flexure, the colon becomes the
descending colon.
Haustra are
expansible pouches of the colon
Approximately the last 15 cm of the digestive tract is the
rectum
The taeniae coli are
longitudinal bands of smooth muscle in the colon wall
A small, wormlike structure attached to the posteromedial surface of the cecum is the
appendix
Identify the salivary gland that secretes a watery mixture rich in salivary amylase and buffers.
submandibular
Each of the following is a function of the liver, except
antibody production.
Which salivary gland produces a serous secretion containing large amounts of salivary amylase?
parotid
Increased secretion by all the salivary glands results from
parasympathetic stimulation
The fusion of the hepatic duct and the cystic duct forms the
common bile duct
The exocrine portion of the pancreas is composed of
pancreatic acini
The pancreas produces
all of the above
The pancreas produces ________-digesting enzymes in the form of proenzymes.
protein
Bile is stored in the
gallbladder