Gastrointestinal sphincters: up and down and ups and downs.
Diamant
N E
NE
D001003:Anal Canal / Q000502:physiology*; D049630:Esophageal Sphincter, Lower / Q000502:physiology*; D049631:Esophageal Sphincter, Upper / Q000502:physiology*; D011708:Pylorus / Q000502:physiology*; D009803:Sphincter of Oddi / Q000502:physiology*