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.
Also, while there is a metro transit system in Manila, it is far too small for the Manila metro area. As seen in the chart above, Manila is the 6th largest metro area but has the 32nd highest metro ridership. As anyone who has ever riden the metro in Manila, it is extremely crowded.