Anatomy and Physiology II Practice Test

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Prepare for the Anatomy and Physiology II Exam with engaging quizzes. Study with flashcards and detailed questions, accompanied by explanations. Ensure your readiness for the test and boost your confidence to succeed!

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What is the role of cholecystokinin in the digestive system?

Stimulates contraction of the gallbladder
Inhibits gastric secretion
Stimulates insulin release
Increases bile production

The correct answer is: Stimulates contraction of the gallbladder

Cholecystokinin (CCK) plays a crucial role in the digestive system primarily by stimulating the contraction of the gallbladder. When food—especially fats and proteins—enters the small intestine, CCK is released from the lining of the small intestine in response to these nutrients. The contraction of the gallbladder causes it to release bile into the duodenum, which is essential for emulsifying fats and aiding in their digestion and absorption. Additionally, while CCK does have other functions such as inhibiting gastric secretion, stimulating the pancreas to produce digestive enzymes, and influencing appetite, its primary action linked to digestion is related to the gallbladder. This makes the stimulation of gallbladder contraction a key factor in the coordinated response necessary for digestive efficiency, particularly in the breakdown of dietary fats.