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.
Tokyo Metro is a rapid transit system serving the capital city of Japan. It is the world's busiest subway with 3.16 billion annual passenger rides (2010) and a daily ridership of 6.31 million people.okyo Metro is the world's busiest subway with a daily ridership of 6.31 million passengers. Tokyo Metro is operated by Tokyo Metro Co. Metro signalling takes place through the Cab Signalling-Automatic Train Control System.