What is the primary function of CCK in the digestive system?

Cholecystokinin (CCK) plays a critical role in the digestive system, and understanding its functions helps illustrate why the combined effects of stimulating gallbladder contraction and enhancing pancreatic enzyme secretion are vital for digestion.

CCK is released from the intestinal mucosa in response to the presence of fatty acids and amino acids in the small intestine. One of its primary functions is to stimulate the gallbladder to contract, which leads to the release of bile into the small intestine. This bile is crucial for the emulsification and absorption of dietary fats.

In addition to its role with the gallbladder, CCK also enhances pancreatic enzyme secretion. The pancreas secretes enzymes that are essential for digestion, including lipases, proteases, and amylases. These enzymes break down fats, proteins, and carbohydrates, respectively, facilitating nutrient absorption.

By stimulating both gallbladder contraction and pancreatic enzyme secretion, CCK ensures that fats can be properly digested and absorbed in the intestines. Therefore, it is accurate to state that the primary function of CCK encompasses both stimulating gallbladder contraction and enhancing pancreatic enzyme secretion, making the combination of these effects essential for effective digestion.