What is the primary function of insulin in the body?

Insulin plays a crucial role in the body's metabolism, particularly in managing blood glucose levels. Its primary function is to facilitate the uptake of glucose into cells, allowing them to use glucose as a source of energy. When glucose enters the cells, it can be either utilized immediately for energy or stored in the liver and muscles as glycogen for later use. This action of insulin is vital in maintaining normal blood sugar levels, especially after meals when blood sugar levels typically rise.

While the regulation of blood pressure, digestion, and body temperature are important bodily functions, they are not directly associated with insulin's action. Insulin specifically addresses the utilization of glucose, making it essential for metabolic processes and energy management within the body.