Does Insulin move glucose into cells or out of cells?

Insulin plays a crucial role in regulating glucose levels in the blood by facilitating the transport of glucose into cells. When insulin is released, such as after a meal when blood sugar levels rise, it binds to insulin receptors on the surface of various cells, including muscle and fat cells. This binding initiates a series of signaling events that promote the translocation of glucose transporter proteins, particularly GLUT4, to the cell membrane.

Once these transporters are present on the cell membrane, they allow glucose to enter the cell. Inside the cell, glucose can then be utilized for energy production or stored as glycogen for later use. This process is vital for maintaining normal blood glucose levels and ensuring that cells receive the energy they need to function properly.

This mechanism highlights why the correct answer is that insulin moves glucose into cells, as it directly aids in the uptake and utilization of glucose by the body's cells.