Which of the following describes the metabolic effect of insulin?

Insulin plays a critical role in the body's metabolism, particularly in the regulation of blood glucose levels. One of its primary functions is to stimulate glucose uptake by tissues, especially in muscle and adipose (fat) tissue. When insulin is released into the bloodstream, it facilitates the transport of glucose from the blood into these cells, where it can be utilized for energy or stored for future use. This action significantly lowers blood glucose levels, helping to maintain homeostasis.

Additionally, insulin promotes the synthesis of glycogen in the liver and muscles, contributes to fat storage by promoting lipogenesis, and enhances protein synthesis in various tissues. This anabolic effect is essential for growth, repair, and maintaining energy reserves in the body.

In contrast, options such as increasing blood glucose levels, reducing protein synthesis, and limiting fat storage do not align with insulin's metabolic functions, which are primarily geared towards lowering blood glucose and promoting storage and synthesis processes.