Blood Glucose
Blood glucose is the sugar in your blood that gives every cell in your body the energy to work.
Think of it this way
Your blood is like a bowl of soup with small sugar cubes floating in it. Each cell in your body is a small box sitting next to the bowl. The box has a tiny slot on its side that lets sugar cubes enter one at a time. When too many cubes fill the soup, a signal tells the slot to open wider so cubes move into the box faster.
Explaining blood glucose by grade level
A horse eats hay and its body turns the hay into sugar. That sugar goes into the blood and travels to every part of the horse. The sugar gives the horse energy to run and play. Different types of hay give the horse different amounts of sugar.