Insulin and Blood Glucose Regulation

The endocrine system plays a vital role in regulating various physiological processes through hormone release. One of the key glands involved is the pancreas, which is essential for glucose metabolism. A deficiency in the hormone produced by the pancreatic beta cells can lead to serious metabolic disorders. In particular, this hormone's main action is to decrease blood glucose levels by facilitating the uptake of glucose into tissues.

Which hormone is primarily responsible for the regulation of blood glucose levels?