Now, certain people experience a condition known as hypoglycemia. And hypoglycemia simply means we have an abnormally low concentration of glucose inside our blood. And what happens is these alpha cells release glucagon. And what glucagon does, as we'll see in just a moment, is ultimately increase the concentration of glucose inside our blood. And that means the cells can use that glucose to basically create ATP and use it as an energy source. So we mentioned that glucagon is a peptide hormone and that means it's water soluble and so it can easily dissolve inside our blood and it doesn't need any protein carrier to transport it inside our blood.