Answer:
Pancreas.
Step-by-step explanation:
Pancreas has dual system, this works as an organ of the digestive system and endocrine system that secretes important hormone. The stomach is located in the abdomen.
The pancreas releases bicarbonate ions that acts as a buffer. Pancreas secrete digestive enzymes like lipase, amylase that helps in the digestion of carbohydrates, fats , proteins and nucleic acid.
Thus, the answer is pancreas.