Which of the following hormones is directly involved in promoting the uptake of glucose into cells?

The hormone that plays a direct role in promoting the uptake of glucose into cells is insulin. Insulin is produced by the beta cells of the pancreas in response to elevated blood glucose levels, such as after a meal. It facilitates the transport of glucose from the bloodstream into cells, particularly in muscle and adipose (fat) tissue, by promoting the insertion of glucose transporter proteins into cell membranes. This process is essential for regulating blood sugar levels and providing energy to cells.

Insulin not only helps in glucose uptake but also plays a significant role in metabolism, encouraging the storage of glucose as glycogen in the liver and promoting fatty acid synthesis. Thus, its primary function in glucose homeostasis highlights its critical importance in managing energy levels in the body. As blood sugar levels decrease due to insulin action, it ensures that cells receive the necessary glucose for energy production and other metabolic processes.