1 The pancreas is an abdominal gland situated behind the stomach in the upper abdomen.  The main function of the pancreas is to secrete hormones and enzymes that help with digestion and regulate blood sugar (glucose) metabolism.
See also: List of tram and light rail transit systems. The Shanghai Metro is the longest metro system by route length. The Beijing Subway is the metro system with the highest ridership. The New York City Subway has the most stations.
The Metropolitan Atlanta Rapid Transit Authority, known as MARTA, provides bus and rapid rail service to the most urbanized portions of the Atlanta metropolitan area. The ninth-largest transit system in the United States, MARTA serves an average of more than 550,000 passengers a day.