What is the function of cholecystokinin?

Cholecystokinin (CCK) is a hormone that plays a crucial role in digestion, particularly in the presence of fats and proteins in the small intestine. When food, especially fatty food, enters the duodenum, CCK is released from the intestinal cells. The primary function of CCK is to stimulate the contraction of the gallbladder, which results in the release of bile into the small intestine. This bile is essential for the emulsification of fats, enhancing the digestive process.

Additionally, CCK also aids in the digestion of proteins by promoting the secretion of digestive enzymes from the pancreas. However, its main and most recognized role is in stimulating gallbladder contraction, allowing for efficient digestion and absorption of nutrients after meals. This function is critical to ensure that the bile is available to help digest dietary fats effectively.