Insulin oscillation oscillations. The insulin oscillations are generated by pulsatile release of the hormone from the pancreas. Insulin originates from beta cells located in the islets of Langerhans. Since each islet contains up to 2000 beta cells and there are one million islets in the pancreas it is apparent that pulsatile secretion requires sophisticated synchronization both within and among the islets of Langerhans. Pulsatile insulin secretion from individual beta cells is driven by oscillation of the calcium concentration in the cells. In beta cells lacking contact, the periodicity of these oscillations is rather variable (2-10 min). However, within an islet of Langerhans
Trumpeter Islets Trumpeter Islets The Trumpeter Islets comprise a group of two unpopulated islets, with a combined area of about a hectare, located close to the south-western coast of Tasmania, Australia. Situated some where the mouth of Port Davey meets the Southern Ocean, the island is part of the Trumpeter Islets Group, and comprises part of the Southwest National Park and the Tasmanian Wilderness World Heritage Site. The islets are part of the Port Davey Islands Important Bird Area, so identified by BirdLife International because of its importance for breeding seabirds. Recorded breeding seabird and wader species are the little penguin (1000