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.
Largest Metro Systems In The World: Shanghai Metro. 7. Beijing Subway, Beijing, China â 232 stations â Beijing Subway is the busiest metro system in the world with over 3.2 billion users each year! China can be proud of being the only country with metro systems in this list. Largest Metro Systems In The World: Beijing Subway.