Question 1

The primary function of the large intestine is to:

Accepted Answer

A)  prepare and store unabsorbed food residue for excretion.
B)  absorb digested nutrients.
C)  neutralize chyme.
D)  All of these choices are correct. A

Question 2

Stomach emptying is affected by all of the following EXCEPT:

Accepted Answer

A)  the nutrient composition of a meal.
B)  the time of day the meal is consumed.
C)  the meal consistency (liquid versus solid) .
D)  emotional states (sadness,anger,stress) . B

Question 3

The internal lining of the gastrointestinal tract is the:

Accepted Answer

A)  submucosa.
B)  serosa.
C)  muscularis.
D)  mucosa. D

Question 4

The _____________ regulates the movement of molecules in and out of cells.

Accepted Answer

A)  cytoplasm
B)  mitochondria
C)  cell membrane
D)  cell wall

Question 5

The sphincter that regulates the flow of chyme from the stomach into the small intestine is the __________ sphincter.

Accepted Answer

A)  gastroesophageal
B)  celiac
C)  anal
D)  pyloric

Question 6

The hepatic portal circulation carries nutrients from the small intestine to the:

Accepted Answer

A)  brain.
B)  kidneys.
C)  stomach.
D)  liver.

Question 7

Inflammation of the small intestinal mucosa reduces the ability of the intestine to absorb water or nutrients causing:

Accepted Answer

A)  constipation.
B)  diarrhea.
C)  gastroesophageal reflux disease.
D)  gallstones.

Question 8

________ are protein molecules that accelerate the rate of chemical reactions.

Accepted Answer

A)  Hormones
B)  Chylomicrons
C)  Enzymes
D)  Buffers

Question 9

Which of the following is NOT a product released by the GI tract?

Accepted Answer

A)  Mucus
B)  Enzymes
C)  Chyme
D)  Hormones

Question 10

_________ are units of matter that cannot be further broken down by chemical means.

Accepted Answer

A)  Organic compounds
B)  Cells
C)  Atoms
D)  Solvents

Question 11

The most common cause of ulcers is:

Accepted Answer

A)  chronic use of the pain reliever Tylenol.
B)  eating large amounts of acidic foods such as peppers and tomatoes.
C)  a bacterial infection.
D)  stress.

Question 12

Describe the signals that regulate gastric secretion and motility.

Accepted Answer

The answer of Describe the signals that regulate gastric secretion...

Question 13

How do the gallbladder and pancreas contribute to the process of digestion?

Accepted Answer

The answer of How do the gallbladder and pancreas contribute...

Question 14

What factors impact the rate at which food leaves the stomach?

Accepted Answer

The answer of What factors impact the rate at which...

Question 15

Coordinated muscular contractions that move food through the GI tract are called:

Accepted Answer

A)  segmentation.
B)  muscular syncopation.
C)  gastroesophageal sphincterization.
D)  peristalsis.

Question 16

Which statement about Helicobacter pylori is true?

Accepted Answer

A)  These microorganisms are killed by the low pH of the stomach secretions.
B)  Dr.B.J.Marshall developed gastric inflammation after he drank a culture of H.pylori.
C)  H) pylori causes irritable bowel syndrome.
D)  H) pylori only causes ulcers if the stomach is already inflamed from stress.

Question 17

Transit time is the rate at which food:

Accepted Answer

A)  moves through the digestive tract.
B)  is swallowed.
C)  is absorbed into the blood.
D)  is broken down into chyme.

Question 18

Nutrients classified as "organic molecules" have a molecular structure which contains the element:

Accepted Answer

A)  carbon.
B)  oxygen.
C)  nitrogen.
D)  sulfur.

Question 19

The sum of the chemical reactions that occur inside body cells is collectively referred to as:

Accepted Answer

A)  digestion.
B)  absorption.
C)  metabolism.
D)  hydrolysis.

Question 20

The absorption of nutrients by simple diffusion requires:

Accepted Answer

A)  a carrier molecule.
B)  energy.
C)  a concentration gradient.
D)  All of these choices are correct

Exam 3: Digestion, Absorption, and Metabolism