Question 1

Which hormone is primarily responsible for stimulating the contraction of the gallbladder, leading to the release of bile into the duodenum?

Accepted Answer

Cholecystokinin (CCK)

Question 2

What is the main stimulus for the release of secretin from the duodenal mucosa?

Accepted Answer

Acidic chyme entering the duodenum

Question 3

Which of the following best describes the effect of secretin on the pancreas?

Accepted Answer

Stimulates the release of bicarbonate-rich pancreatic juice

Question 4

A patient has a blockage of the hepatopancreatic sphincter. Which of the following is most likely to be impaired?

Accepted Answer

Entry of bile and pancreatic juice into the duodenum

Question 5

Which hormone is released in response to fatty chyme in the duodenum and stimulates both pancreatic enzyme secretion and gallbladder contraction?

Accepted Answer

Cholecystokinin (CCK)

Question 6

Which of the following best explains why bile secretion increases after a fatty meal?

Accepted Answer

Fatty acids in the duodenum stimulate CCK release, which contracts the gallbladder and relaxes the hepatopancreatic sphincter.

Question 7

Which of the following is a direct effect of secretin on the liver?

Accepted Answer

Stimulates the liver to produce more bile

Question 8

If the duodenum fails to secrete CCK, which of the following processes would be most directly affected?

Accepted Answer

Contraction of the gallbladder and release of pancreatic enzymes

Question 9

Which of the following best describes the role of the hepatopancreatic sphincter?

Accepted Answer

It regulates the entry of bile and pancreatic juice into the duodenum.

Question 10

A patient with a deficiency in secretin would most likely experience which of the following symptoms after eating a meal high in acid?

Accepted Answer

Inadequate neutralization of acidic chyme in the duodenum

Question 11

Which of the following equations best represents the neutralization of acidic chyme in the duodenum by pancreatic juice?

Accepted Answer

$$\mathrm{HCl} + \mathrm{$$NaHCO_3$$} \rightarrow \mathrm{NaCl} + \mathrm{H_2O} + \mathrm{CO_2$}$$

Question 12

Which of the following best explains why CCK and secretin are considered to have a synergistic effect on pancreatic secretion?

Accepted Answer

CCK stimulates enzyme-rich secretion, while secretin stimulates bicarbonate-rich secretion, together optimizing digestion.

Question 13

A patient with a non-functioning gallbladder would have the most difficulty digesting which type of nutrient?

Accepted Answer

Fats

Question 14

Which of the following is the most powerful stimulus for bile secretion by the liver?

Accepted Answer

Reabsorption of bile salts from the enterohepatic circulation

Question 15

Which hormone is responsible for relaxing the hepatopancreatic sphincter, allowing bile and pancreatic juice to enter the duodenum?

Accepted Answer

Cholecystokinin (CCK)

Mechanisms Promoting Secretion and Release of Bile and Pancreatic Juice

Study Guide - Practice Questions