| When the pancreas fails to make proper amounts of insulin, the individual has the disease called diabetes. [2] Insulin is a hormone that signals fat, muscle, and liver cells to take glucose from the blood plasma into the interior of the cells to be used for cellular respiration. The most common analogy of this is that insulin is like a key that unlocks the cells of the body, which in turn allows glucose to enter the cells to be used for energy.[5] | | | | | | | | |
