Development of the endocrine system alpha cells. The insulin concentration within the fetal pancreas is 3.6 pmol/g at seven to ten weeks, which rises to 30 pmol/g at 16–25 weeks of gestation. Near term, the insulin concentration increases to 93 pmol/g. The endocrine cells have dispersed throughout the body within 10 weeks. At 31 weeks of development, the islets of Langerhans have differentiated. While the fetal pancreas has functional beta cells by 14 to 24 weeks of gestation, the amount of insulin that is released into the bloodstream is relatively low. In a study of pregnant women carrying fetuses in the mid-gestation and near term
Ryan Langerhans again selected to the All-State team. That season, Langerhans also won 11 games as a pitcher. During his senior season in 1998, Langerhans batted .512, was named to the All-State team, was selected as a Nike All-American, was selected to play in the 1998 Texas High School All-Star Game, and was named Texas Player of the Year. Langerhans is one of five players who attended Round Rock High School and have played in the major leagues. The four other players are John Danks, Brian Gordon, Jordan Danks and Travis Schlichting. Ryan Langerhans's father, John Langerhans, was his coach while playing