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
NHSBT Blood Donation NHSBT Blood Donation NHSBT Blood Donation (previously the National Blood Service or NBS) is responsible for the collection and distribution of blood products within England. Other parts of the United Kingdom are served by the Northern Ireland Blood Transfusion Service, the Scottish National Blood Transfusion Service, and the Welsh Blood Service. Blood Donation is part of NHS Blood and Transplant, which was established as a special health authority in October 2005 and also has responsibility for NHSBT Organ Donation and Transplantation. Blood Donation collects at a combination of community-based temporary donation centres and 23 permanent blood donation venues across England,