Glucose and Insulin

After you eat a meal, the glucose levels in your blood rise. This stimulates your pancreas to secrete insulin, which binds to receptors on your liver, muscle, and fat cells. When insulin binds to the extracellular domain on these receptors, it causes the intracellular domain to phosphorylate itself, which triggers a whole phosphorylation cascade including different proteins. This cascade prompts glucose transport proteins to fuse into the cell membrane, allowing glucose in the blood to pass through them and into the cell, where it can be utilized to provide energy by making ATP.