Question 1

The exact causes of inflammatory bowel diseases continue to be explored,but it is relatively clear that:

Accepted Answer

A) it is equally common among people of all ages and racial groups within the population. 
B) it is likely to result from a combination of environmental and genetic factors. 
C) individuals suffering from its effects are largely experiencing the consequences of the absence of immune mechanisms in the gastrointestinal tract. 
D) it can be easily diagnosed since its symptoms are always very specific and the affected areas are always limited to a very focused area within the small intestine. 
E) the cause is allergy to a single particular food,and patients get immediate relief by simply not eating that food.

Question 2

In which region(s)of the GI tract do peristaltic contractions occur?

Accepted Answer

A) the small intestine 
B) the large intestine 
C) the stomach 
D) the esophagus 
E)  All of these options are correct.

Question 3

The primary kind of motility in the stomach during digestion of a meal is:

Accepted Answer

A) peristalsis. 
B) segmentation. 
C) relaxation of the pyloric sphincter. 
D) mass movement. 
E) regurgitation.

Question 4

The same hormone that stimulates pancreatic enzyme secretion stimulates pancreatic bicarbonate secretion.

Accepted Answer

A) True 
 B)False

Question 5

Bile secreted by the liver contains the major enzymes for digesting fats.

Accepted Answer

A) True 
 B)False

Question 6

Lactose intolerance:

Accepted Answer

A) is an inability to digest milk sugar. 
B) is most common in very young children. 
C) results from the inability to secrete insulin. 
D)  results from removal of the gallbladder. 
E) is an inability to digest proteins.

Question 7

About 95 percent of the bile salts secreted by the liver is recycled back to the liver by the enterohepatic circulation.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following statements about pancreatic enzymes is FALSE?

Accepted Answer

A) Trypsinogen is secreted in an inactive form. 
B) Pancreatic amylase digests carbohydrates. 
C) Pancreatic lipase digests fats. 
D) Except for trypsinogen,other proteolytic enzymes are secreted in active form. 
E) Trypsinogen is activated by enterokinase.

Question 9

The presence of food in the mouth stimulates salivary gland secretion.

Accepted Answer

A) True 
 B)False

Question 10

Which of the following processes is NOT associated with gastrointestinal function?

Accepted Answer

A) digestion 
B) filtration 
C) secretion 
D) motility 
E) absorption

Question 11

Which is TRUE regarding the secretion of HCl in the stomach?

Accepted Answer

A)  H+ is actively transported into the gastric lumen by ATPase pumps in the mucosal membrane. 
B) H+ is actively cotransported into the lumen by secondary active transporters coupled to K+. 
C) The pH of the blood leaving the area of the parietal cells is lower than the normal ECF value of 7.4. 
D) H+ diffuses passively from mucosal epithelial cells into the lumen of the stomach,following Cl-. 
E) Cl- and HCO3- are exchanged across the luminal membrane of epithelial cells via a passive transport protein.

Question 12

The enzyme,lactase:

Accepted Answer

A) is involved directly in the digestion of proteins. 
B) is necessary for the breakdown of milk fats. 
C) is embedded in the luminal plasma membranes of intestinal epithelial cells. 
D) promotes the formation of and storage of bile by the gallbladder. 
E) is overproduced and released by secretory cells in the small intestine in the condition known as lactose intolerance.

Question 13

Which of the following is secreted by the chief cells of the gastric mucosa?

Accepted Answer

A) pepsinogen 
B) HCl 
C) intrinsic factor 
D) gastrin 
E) pepsin

Question 14

Removal of the stomach would interfere with absorption of vitamin B12.

Accepted Answer

A) True 
 B)False

Question 15

Food is propelled down the esophagus primarily as a result of segmentation contractions of esophageal smooth muscle.

Accepted Answer

A) True 
 B)False

Question 16

Which of the following molecules crosses the luminal membrane of intestinal cells by facilitated diffusion?

Accepted Answer

A) glucose 
B) lactose 
C) fructose 
D) galactose 
E) maltose

Question 17

Because the large intestine has a greater diameter than the small intestine,the large intestine has a greater surface area.

Accepted Answer

A) True 
 B)False

Question 18

The breakdown products of dietary triglycerides are resynthesized into triglycerides by intestinal cells and pass from these cells into lacteals.

Accepted Answer

A) True 
 B)False

Question 19

Which correctly describes a major function of the stomach?

Accepted Answer

A) the complete digestion of protein to amino acids 
B) maintaining an alkaline pH for the digestion of proteins 
C) absorption of saliva and chyme into the bloodstream 
D) lubricating food so it can be formed into a bolus 
E) storing ingested food and partially digesting macromolecules

Question 20

The volume of fluids secreted by the gastrointestinal tract in a typical day is far greater than the volume of food and drink ingested.

Accepted Answer

A) True 
 B)False

Exam 15: The Digestion and Absorption of Food

The exact causes of inflammatory bowel diseases continue to be explored,but it is relatively clear that:

In which region(s) of the GI tract do peristaltic contractions occur?

The primary kind of motility in the stomach during digestion of a meal is:

The same hormone that stimulates pancreatic enzyme secretion stimulates pancreatic bicarbonate secretion.

Bile secreted by the liver contains the major enzymes for digesting fats.

Lactose intolerance:

About 95 percent of the bile salts secreted by the liver is recycled back to the liver by the enterohepatic circulation.

Which of the following statements about pancreatic enzymes is FALSE?

The presence of food in the mouth stimulates salivary gland secretion.

Which of the following processes is NOT associated with gastrointestinal function?

Which is TRUE regarding the secretion of HCl in the stomach?

The enzyme,lactase:

Which of the following is secreted by the chief cells of the gastric mucosa?

Removal of the stomach would interfere with absorption of vitamin B12.

Food is propelled down the esophagus primarily as a result of segmentation contractions of esophageal smooth muscle.

Which of the following molecules crosses the luminal membrane of intestinal cells by facilitated diffusion?

Because the large intestine has a greater diameter than the small intestine,the large intestine has a greater surface area.

The breakdown products of dietary triglycerides are resynthesized into triglycerides by intestinal cells and pass from these cells into lacteals.

Which correctly describes a major function of the stomach?

The volume of fluids secreted by the gastrointestinal tract in a typical day is far greater than the volume of food and drink ingested.