The role of insulin in the body is to regulate blood glucose levels. Produced by the pancreas, insulin facilitates the uptake of glucose into cells, allowing for its use as energy. It also promotes the storage of excess glucose in the liver and muscle tissue as glycogen. Insulin plays a critical role in maintaining overall metabolic balance, and dysfunction in insulin production or action can lead to conditions such as diabetes mellitus. Therefore, understanding insulin's mechanisms is fundamental for managing blood sugar levels and preventing associated health complications.