Blood sugar level several interacting systems, of which hormone regulation is the most important. There are two types of mutually antagonistic metabolic hormones affecting blood glucose levels: These hormones are secreted from pancreatic islets which are bundles of endocrine tissues. There are four types of pancreatic islets, alpha (A) cells, beta (B) cells, Delta (D) cells and F cells. Glucagon is secreted from alpha cells, while insulin is secreted by beta cells. Together they regulate the blood-glucose levels through negative feedback, a process where the end product of one reaction stimulates the beginning of another reaction. In blood-glucose levels, insulin lowers the concentration
Students for Organ Donation community. Students for Organ Donation focuses on providing educational development regarding organ and tissue registration by: educating individuals about the issue, encouraging individuals to register as organ donors, and giving them the means with which to register. In 2005, the organization was awarded the "Youth Education Award" from Donate Life America, for outstanding efforts to promote organ donation awareness among youth. It was also awarded a $10,000 Do Something BRICK Award and $5,000 Goldman Sachs Global Leaders Social Entrepreneurship Grant to fund expansion. Students for Organ Donation Students for Organ Donation is a nonprofit organization dedicated to promoting organ donation