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.
Chicago is the one of the most important logistics and transportation hubs in the U.S. with a powerful network of rail, airport and truck routes that reach nationwide markets. Chicago is also the largest industrial real estate market in the country, with 1.3 billion square feet of warehouse space.