The hormone that is secreted in the part of the human body that produces bile juice is cholecystokinin (CCK).

Here's how it works:

* Bile Production: The liver produces bile, a fluid essential for fat digestion.

* Bile Storage: Bile is stored in the gallbladder.

* CCK Release: When fatty foods enter the small intestine, the intestine releases CCK.

* Gallbladder Contraction: CCK stimulates the gallbladder to contract, releasing bile into the small intestine.

* Digestion: Bile helps break down fats into smaller molecules, making them easier to digest and absorb.

So, while the liver produces bile, it's the release of CCK from the small intestine that triggers the gallbladder to release the bile into the digestive system.