THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -Food passing from your stomach into the first part of your small intestine (duodenum) triggers the next stage of the digestive process. When cells in the mucosal lining of your duodenum (called I-cells) detect the presence of proteins and fats to digest, they trigger cholecystokinin to release into circulation.

Detailed explanation-2: -cholecystokinin (CCK), formerly called pancreozymin, a digestive hormone released with secretin when food from the stomach reaches the first part of the small intestine (duodenum).

Detailed explanation-3: -The first part of the small intestine. It connects to the stomach. The duodenum helps to further digest food coming from the stomach.