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
Cuban sugar economy price of 6.11 cents per pound from 1965 to 1970. Due to decreasing sugar prices after 1963, the Soviet Union paid almost twice the world price of sugar. Additionally, Cuba failed to increase its sugar production to the promised level of 10 million tons by 1970 resulted in the Soviet Union subsidizing Cuban sugar by more than $1.1 billion during this time. However, Cuba was not paid in currency but rather in Soviet goods on a barter basis, which cost up to 50% more than similar goods from non-Soviet countries. Cuba was also responsible for repaying loans to the Soviet