Chapter 29 Physiology of the Digestive System

Chapter 29  Physiology of the Digestive System

TRUE/F ALSE

1. The bolus of food is formed during the pharyngeal stage of deglutition.

ANS: F DIF: Memorization REF: Page 904 TOP: Mechanical Digestion

2. Respiration is inhibited for the 1 to 3 seconds required for food to clear the pharynx during each swallowing.

ANS: T DIF: Memorization REF: Page 904 TOP: Mechanical Digestion

3. To propel food from the pharynx into the esophagus, three openings must be blocked.

ANS: T DIF: Memorization REF: Page 904 TOP: Mechanical Digestion

4. Peristalsis is a back-and-forth action that breaks apart chunks of food and mixes in digestive juices.

ANS: F DIF: Memorization REF: Page 906 TOP: Mechanical Digestion

5. The process of emptying the stomach takes about 12 hours after a meal.

ANS: F DIF: Memorization REF: Page 906 TOP: Regulation of Motility

6. After leaving the stomach, chyme normally takes about 5 hours to pass all the way through the small intestine.

ANS: T DIF: Memorization REF: Page 908 TOP: Regulation of Motility

7. Enzymes are unique in that they can function optimally within a wide range of pH.

ANS: F DIF: Memorization REF: Page 909 TOP: Chemical Digestion

Mosby items and derived items © 2013, 2010, 2007, 2003 by Mosby, Inc., an affiliate of Elsevier Inc.

Test Bank 29A-2

8. Enzymes are usually defined as inorganic catalysts.
ANS: F DIF: Memorization REF: Page 908

TOP: Chemical Digestion

MULTIPLE CHOICE

1. Which of the following is not one of the openings that must be blocked when food moves from the pharynx into the esophagus?
a. Oropharynx
b. Nasopharynx

c. Larynx d. Mouth

ANS: A DIF: Memorization TOP: Mechanical Digestion

2. The process of swallowing is known as: a. mastication.
b. deglutition.
c. peristalsis.

d. segmentation.

ANS: B DIF: Memorization TOP: Mechanical Digestion

REF: Page 904

REF: Page 904

3. Which of the following is a true statement?
a. The oral stage of swallowing is involuntary and under the control of the cerebral

cortex.

2. The pharyngeal stage of deglutition is voluntary.
3. The esophageal stage of swallowing is involuntary.
4. Both B and C are correct.

ANS: C DIF: Memorization TOP: Mechanical Digestion

REF: Page 904

4. Which of the processes of mechanical digestion involves the esophagus?

1. Deglutition
2. Peristalsis
3. Churning

d. Both A and B

ANS: D
906
TOP: Mechanical Digestion

REF: Page 904|Page

DIF: Memorization

Mosby items and derived items © 2013, 2010, 2007, 2003 by Mosby, Inc., an affiliate of Elsevier Inc.

Test Bank

29B-2

5. The enterogastric reflex causes:

1. secretion of digestive enzymes in the small intestine.
2. secretion of digestive enzymes in the stomach.
3. inhibition of gastric peristalsis.
4. acceleration of gastric peristalsis.

ANS: C DIF: Memorization TOP: Mechanical Digestion

REF: Page 907

6. Which of the following is not true of enzymes?

1. They accelerate chemical reactions.
2. They change chemically and are in the end products of the reaction.
3. They are vital to chemical reactions.
4. Many contain vitamins in their structure.

ANS: B DIF: Memorization TOP: Chemical Digestion

7. Which step of deglutition is under voluntary control?
   1. Oral stage
   2. Pharyngeal stage
   3. Esophageal stage
   4. Gastric phase

   ANS: A DIF: Memorization TOP: Mechanical Digestion

8. The purpose of peristalsis is to:
   1. break apart chunks of food and mix it in digestive juices.
   2. propel food forward along the GI tract.
   3. absorb food.
   4. enable swallowing.

   ANS: B DIF: Memorization TOP: Mechanical Digestion

REF: Page 908

REF: Page 904

REF: Page 906