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 New York City Subway is one of the world's oldest public transit systems, one of the world's most used metro systems, and the metro system with the most stations and the most trackage. It offers rail service 24 hours per day and every day of the year.