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
Islets of Granada Islets of Granada The islets of Granada (Spanish: "Isletas de Granada") are located in Lake Nicaragua, just southeast of the city of Granada in Nicaragua. The islets are a group of 365 small islands scattered about the Asese peninsula. The islets are of volcanic origin, they were formed when the Mombacho volcano blew much of its cone into the lake thousands of years ago, thereby creating the archipelago. Most of the islets are covered with vegetation and rich with bird life. Many of the islets are occupied. Some are privately owned and hold homes or vacation houses. There are facilities