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
Spreckels Organ Pavilion Spreckels Organ Pavilion Spreckels Organ Pavilion houses the open-air Spreckels Organ in Balboa Park, San Diego, California. The Spreckels Organ is the world's largest pipe organ in a fully outdoor venue. Constructed for the 1915 Panama-California Exposition, it is located at the corner of President's Way and Pan American Road East in the park. John D. Spreckels, son of sugar magnate Claus Spreckels, was one of the wealthiest residents in San Diego County. He supported the Panama-California Exposition, and during its construction, he and his brother Adolph B. Spreckels gave the organ pavilion as a gift to "the people of