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 is also a digestive organ, secreting pancreatic juice containing digestive enzymes that assist digestion and absorption of nutrients in the small intestine.These enzymes help to further break down the carbohydrates, proteins, and lipids in the chyme.he pancreas is also a digestive organ, secreting pancreatic juice containing digestive enzymes that assist digestion and absorption of nutrients in the small intestine.