RQ-1A Predator is a long-endurance, medium-altitude unmanned aircraft system for surveillance and reconnaissance missions. Predator UAVs have been operational in Bosnia since 1995, where they have flown more than 600 missions for more than 4,000h in support of Nato, UN and US operations. Predator operated from a tactical control station located aboard the USS Carl Vinson, Nimitz class aircraft carrier.
Secretin functions as a type of fireman: it is released in response to acid in the small intestine, and stimulates the pancreas and bile ducts to release a flood of bicarbonate base, which neutralizes the acid. Secretin is also of some historical interest, as it was the first hormone to be discovered. similar, but quantitatively less important response to secretin is elicited by bile duct cells, resulting in additional bicarbonate being dumped into the small gut. As acid is neutralized by bicarbonate, the intestinal pH rises toward neutrality, and secretion of secretin is turned off.
The pancreas plays a vital role in the digestive system. It secretes fluid that contains enzymes into the duodenum. These enzymes help to break down carbohydrates (usually starch), proteins and lipids (fats). This role is called the exocrine role of the pancreas.