Question 1

The three most abundant classes of nutrients are

Accepted Answer

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.F) A) and C)
G) B) and E)

Question 2

Defecation is stimulated by

Accepted Answer

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.F) A) and B)
G) B) and E)

Question 3

Chemical digestion breaks down into .

Accepted Answer

A)  proteins; nucleotides
B)  amino acids; proteins
C)  polysaccharides; amino acids
D)  nucleic acids; nucleotides
E)  fatty acids; cholesterolF) None of the above
G) A) and D)

Question 4

These are normally found in saliva except

Accepted Answer

A)  mucus.
B)  lysozyme.
C)  amylase.
D)  lipase.
E)  protease.F) A) and B)
G) B) and E)

Question 5

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

Accepted Answer

A) True 
 B)False

Question 6

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?

Accepted Answer

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, serosaF) C) and D)
G) D) and E)

Question 7

is a hormone, whereas is an enzyme.

Accepted Answer

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

Question 8

The liver is the body's largest gland.

Accepted Answer

A) True 
 B)False

Question 9

Why are several digestive enzymes secreted as zymogens?

Accepted Answer

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

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

This image shows the stomach.What does "3" represent?

Accepted Answer

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

Question 12

Which of the following enzymes functions at the lowest pH?

Accepted Answer

A)  salivary amylase
B)  pancreatic amylase
C)  pepsin
D)  trypsin
E)  dipeptidaseF) All of the above
G) A) and D)

Question 13

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

Accepted Answer

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 involuntaryF) B) and C)
G) C) and D)

Question 14

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

Accepted Answer

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 submucosaF) A) and D)
G) A) and E)

Question 15

The organ that stores excess glucose and releases it later into the blood is

Accepted Answer

A)  the pancreas.
B)  the stomach.
C)  the liver.
D)  the spleen.
E)  the small intestine.F) A) and B)
G) A) and C)

Question 16

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

Accepted Answer

A) True 
 B)False

Question 17

transport lipids to the surface of the intestinal absorptive cells, which process them into .

Accepted Answer

A)  Fat droplets; micelles
B)  Fat droplets; chylomicrons
C)  Micelles; fat globules
D)  Micelles; chylomicrons
E)  Fat globules; micellesF) A) and B)
G) B) and E)

Question 18

The synthesizes bile acids by metabolizing .

Accepted Answer

A)  duodenum; neutral fats
B)  ileum; bilirubin
C)  gallbladder; cholesterol
D)  pancreas; bile salts
E)  liver; cholesterolF) B) and C)
G) All of the above

Question 19

Absorption of many nutrients starts in the stomach.

Accepted Answer

A) True 
 B)False

Question 20

Proteins are digested by different enzymes acting in the following sequence

Accepted Answer

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.F) B) and D)
G) B) and C)

Exam 25: The Digestive System

These are normally found in saliva except

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is a hormone, whereas is an enzyme.

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

Correct AnswerverifiedShow Answer

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

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Absorption of many nutrients starts in the stomach.

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Why are several digestive enzymes secreted as zymogens?

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The synthesizes bile acids by metabolizing .

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

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Defecation is stimulated by

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Proteins are digested by different enzymes acting in the following sequence

Correct AnswerverifiedShow Answer

The three most abundant classes of nutrients are

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Chemical digestion breaks down into .

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The liver is the body's largest gland.

Correct AnswerverifiedShow Answer

The organ that stores excess glucose and releases it later into the blood is

Correct AnswerverifiedShow Answer

transport lipids to the surface of the intestinal absorptive cells, which process them into .

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This image shows the stomach.What does "3" represent?

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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?

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Which of the following enzymes functions at the lowest pH?

Correct AnswerverifiedShow Answer

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