While there is an amazingly elegant cascade of chemical and cellular reactions that allows insulin to do what it does, we will benefit much more from understanding what it does rather than how it does it.
I like to think of the body as a massive factory. The blood vessels are the hallways, the organs are departments, the cells are the rooms within the departments where all the real work gets done, and insulin are the workers responsible for managing the fuel supply. Insulin has several responsibilities, but for the sake of this discussion, we are going to focus on three of them.
Keep the glucose fuel at the right level in the hallways
Maintain a steady supply of...