What is Insulin & what does it do if blood glucose level goes too high/low?

1- Hormone: Insulin (produced in pancreas)regulates glucose(needed by cells for respiration) concentration in blood 2- Blood glucose level too high: pancreas produces insulin which causes glucose to move from blood into cells, in the liver and muscle cells, excess glucose converts to glycogen for storage 3- Blood glucose level too low, glucagon(hormone) is released and glycogen turns back into glucose (in liver) and released into bloodstream