Which of the Following is (Are)true of Cholecystokinin (CCK)

Question

Which of the following is (are)true of cholecystokinin (CCK)?
A) Secreted by the walls of the duodenum in response to the presence of fat
B) Stimulates the LES to relax
C) Stimulates the pancreas to secrete insulin
D) All of the above

Accepted Answer

Cholecystokinin (CCK) is secreted by the walls of the duodenum in response to the presence of fat. It stimulates the gallbladder to release bile to break down fats. It also acts on pancreatic acinar cells leading to secretion of digestive enzymes. It does not have an effect on the lower esophageal sphincter (LES) or insulin secretion.