Pancreatic islets by scarce alpha, delta and PP cells in the periphery, human islets display alpha and beta cells in close relationship with each other throughout the cluster. Islets can influence each other through paracrine and autocrine communication, and beta cells are coupled electrically to six to seven other beta cells (but not to other cell types). The paracrine feedback system of the pancreatic islets has the following structure: A large number of G protein-coupled receptors (GPCRs) regulate the secretion of insulin, glucagon and somatostatin from pancreatic islets, and some of these GPCRs are the targets of drugs used to treat type-2
Islets and skerries in the Faroes Islets and skerries in the Faroes Besides the 18 islands of the Faroes there are also several islets and skerries. The Faroe Islands consist of 779 islands, islets and skerries. The islets are small and are geographical parts of the larger islands. Suðuroy consists of 263 islands, islets and skerries, which is the largest number. The islets are measured in square hectometers (hectares), the largest being comparable in size to the smallest island, Lítla Dímun. Here is a list of the largest islets: 1. Tindhólmur (65,0 sqhm), at Sørvágur Vágar 2. Mykineshólmur (45,0 sqhm), at Mykines 3. Trøllhøvdi (19,0 sqhm),