Deck 25: The Digestive System

Question 1

The large intestine absorbs water,fats,and salts.

Answer 1

False

Question 2

Chylomicrons are secreted from the basal surface of the absorptive cells and taken into the lacteal in the villus.

Answer 2

True

Question 3

The brush borders of intestinal absorptive cells contain numerous goblet cells.

Answer 3

False

Question 4

Gastric juice consists entirely of water and hydrochloric acid.

Question 5

Both pancreatic juice and bile are secreted into the duodenum.

Question 6

Odor,sight,and taste stimulate salivatory nuclei in the cerebral cortex.

Question 7

Both chemical and mechanical digestion start in the mouth and continue in the stomach.

Question 8

The physiological process that moves a nutrient from the outside of the body to the inside is called __________.

A)ingestion
B)compaction
C)digestion
D)absorption
E)secretion

Question 9

Most fat is digested by pancreatic lipase.

Question 10

The large intestine is longer than the small intestine.

Question 11

The layer that is responsible for the motility that propels food and residue through the digestive tract is called the __________.

A)lumen
B)muscularis externa
C)submucosa
D)mucosa (mucous membrane)
E)serosa

Question 12

Enamel is found in the crown of a tooth,whereas dentin is part of both the crown and the root.

Question 13

Absorption of many nutrients starts in the stomach.

Question 14

The serous membranes that suspend the stomach and intestines from the abdominal wall are called __________.

A)mesenteries
B)mucosae
C)submucosae
D)muscularis mucosae
E)muscularis externa

Question 15

The enteric nervous system regulates much of the digestive activity,but its action depends on the central nervous system.

Question 16

The outermost layer of the digestive tract,which is composed of a thin layer of areolar tissue and simple squamous epithelium,is called the __________.

A)lumen
B)muscularis externa
C)submucosa
D)mucosa (mucous membrane)
E)serosa (mesentery)

Question 17

Which of the following nutrients must be digested in order to be absorbed?

A)Water
B)Vitamins
C)Proteins
D)Minerals
E)Cholesterol

Question 18

The small intestine begins with the duodenum,which is its longest segment.

Question 19

The liver is the body's largest gland.

Question 20

The digestive system processes food,extracts nutrients,and eliminates the residue.

Question 21

Each of the following lists some of the tissue layers of the digestive tract.Which one has them in correct order from lumen to external surface?

A)Lamina propria, muscularis mucosae, submucosa, muscularis externa, serosa
B)Serosa, lamina propria, submucosa, muscularis mucosae, muscularis externa
C)Mucosa, submucosa, muscularis mucosae, muscularis externa, lamina propria
D)Mucosa, muscularis mucosae, submucosa, muscularis externa, lamina propria
E)Mucosa, submucosa, muscularis externa, lamina propria, serosa

Question 22

The __________ regulates the flow of contents from the stomach to the duodenum.

A)gastric rugae
B)antrum
C)pyloric sphincter
D)fundic region
E)cardiac region

Question 23

The oral phase of swallowing is under __________ control and the pharyngo-esophageal phase is __________.

A)central nervous system; also controlled by the central nervous system
B)central nervous system; controlled by autonomic reflexes
C)autonomic nervous system; controlled by autonomic reflexes
D)voluntary; also voluntary
E)involuntary; also involuntary

Question 24

__________ is a hormone,whereas __________ is an enzyme.

A)Enterokinase; pepsin
B)Gastrin; secretin
C)Gastrin; cholecystokinin (CCK)
D)Gastric lipase; histamine
E)Secretin; pepsin

Question 25

Pepsinogen is produced by __________ and is activated by __________,which is secreted by __________.

A)chief cells; carbonic anhydrase (CAH); parietal cells
B)chief cells; hydrochloric acid (HCl); parietal cells
C)parietal cells; hydrochloric acid (HCl); chief cells
D)parietal cells; carbonic anhydrase (CAH); chief cells
E)enteroendocrine cells; carbonic anhydrase (CAH); parietal cells

Question 26

Necessary for Vitamin B₁₂ absorption,__________ is/are secreted by __________ cells.

A)intrinsic factor; parietal
B)bile salts; chief
C)lecithin; hepatic
D)hydrochloric acid; parietal
E)enterokinase; mucous

Question 27

An example of chemical digestion is the break down of __________ into __________.

A)proteins; nucleotides
B)amino acids; proteins
C)polysaccharides; amino acids
D)nucleic acids; nucleotides
E)fatty acids; cholesterol

Question 28

The surface of the tongue is covered with __________ stratified squamous epithelium,and has bumps called __________,where many taste buds can be found.

A)keratinized; lingual papillae
B)keratinized; lingual frenulum
C)nonkeratinized; lingual papillae
D)nonkeratinized; tonsils
E)nonkeratinized; vallate papillae

Question 29

Acid reflux into the esophagus ("heartburn")is normally prevented by __________.

A)pharyngeal constrictors
B)the upper esophageal sphincter
C)the lower esophageal sphincter (LES)
D)esophageal glands
E)pharyngeal and buccal sphincters

Question 30

The small intestine is suspended from the abdominal wall by the ___________.

A)falciform ligament
B)mesentery
C)greater omentum
D)lesser omentum
E)esophageal hiatus

Question 31

Hydrochloric acid (HCl)is secreted by __________ cells.

A)mucous
B)regenerative (stem)
C)parietal
D)chief
E)enteroendocrine

Question 32

Several digestive enzymes are secreted as zymogens because __________.

A)it saves one step in their synthesis
B)gastric cells do not have the necessary enzymes for their synthesis
C)they start digesting intracellular proteins of the gastric cells more quickly
D)they act only in the stomach lumen and do not digest intracellular proteins
E)they can start digesting dietary proteins more quickly

Question 33

The __________ gland is an extrinsic salivary gland,whereas the __________ gland is an intrinsic salivary gland.

A)lingual; labial
B)submandibular; lingual
C)submandibular; sublingual
D)sublingual; parotid
E)lingual; sublingual

Question 34

The enterogastric reflex serves to __________.

A)relax the stomach in preparation for swallowed food
B)stimulate acid and enzyme secretion when food enters the stomach
C)stimulate intestinal motility when there is food in the stomach
D)inhibit gastric motility when there is chyme in the small intestine
E)relax the ileocecal valve when chyme is on its way to the colon

Question 35

The swallowing center is located in the __________.

A)mouth
B)oropharynx
C)esophagus
D)medulla oblongata
E)enteric nervous system

Question 36

The __________ regulates digestive tract motility,secretion,and blood flow.Its neurons are found in the __________.

A)autonomic nervous system; serosa
B)central nervous system; muscularis externa and muscularis mucosae
C)enteric nervous system; submucosa and muscularis externa
D)visceral sensory division; muscularis externa and submucosa
E)visceral motor division; mucosa and submucosa

Question 37

Which of the following is the correct list of tooth anatomy from the most superficial to the deepest?

A)Cementum, root canal, enamel
B)Enamel, root canal, dentin
C)Dentin, enamel, cementum
D)Enamel, dentin, pulp
E)Crown, enamel, dentin

Question 38

Which of the following is not normally found in saliva?

A)Mucus
B)Lysozyme
C)Amylase
D)Lipase
E)Protease

Question 39

Which of the following is not an accessory organ of digestion?

A)Tongue
B)Liver
C)Pancreas
D)Salivary glands
E)Spleen

Question 40

Infants have __________ deciduous teeth,whereas adults have __________ permanent teeth.

A)20; 32
B)16; 20
C)28; 20
D)32; 20
E)32; 32

Question 41

The __________ of the small intestine is/are similar to the __________ of the stomach.

A)villi; pyloric glands
B)rugae; Peyer patches
C)intestinal crypts; gastric pits
D)goblet cells; parietal cells
E)pyloric sphincter; ileocecal valve

Question 42

Pancreatic enzymes are secreted in response to a hormone called __________.

A)insulin
B)cholecystokinin (CCK)
C)secretin
D)glucagon
E)gastrin

Question 43

Which of the following enzymes functions at the lowest pH?

A)Salivary amylase
B)Pancreatic amylase
C)Pepsin
D)Trypsin
E)Dipeptidase

Question 44

Which of the following nutrients is absorbed by the lacteals of the small intestine?

A)Triglycerides
B)Amino acids
C)Glucose
D)Minerals
E)Water-soluble vitamins

Question 45

Which of the following statements is true regarding the sodium-glucose transport protein (SGLP)?

A)It is a uniport carrier.
B)It is an antiport carrier.
C)It uses solvent drag to transport glucose and sodium.
D)It transports glucose and sodium from the intestinal lumen into the epithelial cells.
E)It transports glucose from the intestinal lumen into the epithelial cells, and sodium in the opposite direction.

Question 46

The __________ synthesizes bile acids by metabolizing __________.

A)duodenum; neutral fats
B)ileum; bilirubin
C)gallbladder; cholesterol
D)pancreas; bile salts
E)liver; cholesterol

Question 47

Of the following components of bile,only __________ has/have a digestive function.

A)bile salts
B)bilirubin
C)cholesterol
D)phospholipids
E)neutral fats

Question 48

Which of the following statements regarding the migrating motor complex is true?

A)It milks the chyme toward the colon.
B)It allows a bolus to move down the esophagus.
C)It churns and mixes residue in the descending colon.
D)It churns and mixes a bolus with gastric juices.
E)It propels pancreatic juice down the pancreatic duct.

Question 49

A hepatic triad consists of __________.

A)the right, left, and common hepatic ducts
B)the common hepatic duct, cystic duct, and bile duct
C)the hepatic portal vein and two hepatic ducts
D)a bile ductule, a branch of the hepatic artery, and a branch of the hepatic portal vein
E)a central vein, a hepatic lobule, and a hepatic sinusoid

Question 50

Lipids are transported to the surface of the intestinal absorptive cells by __________,and are then processed into __________.

A)fat droplets; micelles
B)fat droplets; chylomicrons
C)micelles; fat globules
D)micelles; chylomicrons
E)fat globules; micelles

Question 51

Lecithin prepares fats for hydrolysis by forming __________.

A)triglycerides, fatty acids, and glycerol
B)low density lipoproteins (LDL)
C)chylomicrons
D)emulsification droplets
E)micelles

Question 52

The __________ phase is associated with food stretching the stomach and activating myenteric and vagovagal reflexes,which in turn stimulate gastric secretions.

A)cephalic
B)gastric
C)intestinal
D)gastrointestinal
E)mesenteric

Question 53

Which of the following is not a component of the pancreatic juice?

A)Trypsinogen
B)Chymotrypsinogen
C)Deoxyribonuclease
D)Sodium bicarbonate
E)Enterokinase

Question 54

The __________ stores excess glucose and releases it into the blood when needed.

A)pancreas
B)stomach
C)liver
D)spleen
E)small intestine

Question 55

Which of the following is the proper sequence by which proteins are digested by different enzymes?

A)Pepsin, trypsin, carboxypeptidase, dipeptidase
B)Pepsin, trypsin, dipeptidase, carboxypeptidase
C)Trypsin, pepsin, carboxypeptidase, dipeptidase
D)Trypsin, pepsin, dipeptidase, carboxypeptidase
E)Dipeptidase, carboxypeptidase, pepsin, trypsin

Question 56

Amino acids and monosaccharides are absorbed in the __________,and fatty acids are absorbed in the __________.

A)small intestine; large intestine
B)small intestine; liver
C)stomach; small intestine
D)stomach; large intestine
E)small intestine; small intestine

Question 57

Contact digestion takes place in/at the __________.

A)gastric pits
B)surface of the gastric mucosa
C)intestinal crypts
D)brush border of the small intestine
E)cytoplasm in the cells of the small intestine

Question 58

The enzyme(s)called __________ break(s)down the substrate called __________.

A)lactase; glucose
B)peptidases; proteins
C)lipases; micelles
D)lactose; lactase
E)nucleases; nucleotides

Question 59

Which of the following is not associated with the large absorptive surface of the small intestine?0-2013

A)Circular folds (plicae circulares)
B)Intestinal length
C)Microvilli
D)Villi
E)Rugae

Question 60

Carbohydrate digestion begins in the __________,whereas protein digestion begins in the __________.

A)liver; small intestine
B)small intestine; stomach
C)mouth; stomach
D)mouth; small intestine
E)stomach; small intestine

Question 61

Bacteria constitute about __________% of the dry weight of the feces.

A)2
B)14
C)30
D)55
E)80

Question 62

The three most abundant classes of nutrients are __________.

A)carbohydrates, proteins, and minerals
B)fats, proteins, and carbohydrates
C)proteins, nucleic acids, and carbohydrates
D)triglycerides, starches, and proteins
E)proteins, fats, and minerals

Question 63

Which of the following is not a trigger for mass movements of the colon?

A)The gastrocolic reflex
B)The duodenocolic reflex
C)Chyme filling the duodenum
D)Chyme filling the stomach
E)The colorectal reflex

Question 64

Which of the following is not a function of gastric hydrochloric acid (HCl)?

A)Activate pepsinogen to pepsin
B)Activate lingual lipase
C)Emulsify lipids
D)Destroy ingested pathogens
E)Convert Fe³⁺ to Fe²⁺

Question 65

The movement of colonic contents from one puckered section to another is called __________.

A)the gastrocolic reflex
B)the duodenocolic reflex
C)mass movement
D)haustral contraction
E)defecation

Question 66

Which of the following is true regarding the difference between the mucosa of the small and large intestines?

A)They both have villi, but only the small intestine has microvilli.
B)The small intestine has deeper intestinal crypts than the large intestine.
C)The small intestine has simple columnar epithelium and the large intestine does not.
D)Intestinal crypts are only found in the large intestine.
E)The large intestine has larger circular folds than the small intestine.

Question 67

The enzyme that catalyzes the first step reaction in HCl production by gastric parietal cells is called __________.

A)carbonic acid
B)carbonic anhydrase
C)dipeptidase
D)protease
E)ATPase

Question 68

The muscle tone of the __________ along the colon contracts it lengthwise,causing its walls to bulge and form pouches called __________.

A)circular folds; ceca
B)taeniae coli; haustra
C)haustra; taeniae coli
D)internal sphincters; omental (epiploic) appendages
E)internal sphincters; ceca

Question 69

Defecation is stimulated by __________.

A)the chemical composition of the feces
B)bacterial flora in the feces
C)water content of the feces
D)lipid content in the feces
E)stretching of the rectum

Question 70

Which of the following is not a process carried out by bacterial flora?

A)Digestion of most of the proteins we get in the diet
B)Synthesis of vitamin K
C)Production of some of the gases found in flatus
D)Digestion of cellulose
E)Formation of part of the feces