What is the primary function of insulin in the body?

Insulin's primary function in the body is to lower blood glucose levels by facilitating glucose uptake into the cells. This hormone, produced by the pancreas, plays a critical role in regulating blood sugar levels after meals when glucose from food enters the bloodstream.

When blood glucose levels rise, insulin is released to help cells in the body's tissues, such as muscle and fat, absorb this glucose. Once inside the cells, glucose can be used immediately for energy or stored for later use in the form of glycogen in the liver and muscles. This process is crucial for maintaining normal blood sugar levels and providing energy to the body.

Other functions attributed to insulin include its involvement in lipid metabolism and the inhibition of glucose production by the liver. However, the most direct role is its effect on lowering blood glucose levels, emphasizing the importance of insulin in metabolic regulation and energy homeostasis.