6th Grade · Science · Reading Passage · shared by Luke Morgan
Explore this free 6th Grade Science reading passage on glucose, insulin, glucagon, and the vital feedback loop for cellular energy.
Leo checked his continuous glucose monitor, a small device on his arm that constantly showed his blood sugar levels. Blood sugar, also known as glucose , is the main type of sugar found in your blood. It comes from the food you eat and provides your body with its primary source of energy. Think of glucose as the fuel your cells need to work properly and keep you active. Leo, who has Type 1 Diabetes, understands this important process very well.
After a quick game of basketball, Leo felt hungry and grabbed an apple. As he ate the apple, his body began to digest it. This digestion broke down the apple's carbohydrates into glucose, entering his bloodstream. In a person without diabetes, this rising blood sugar is a signal for the pancreas to release insulin . Because Leo has Type 1 Diabetes, his pancreas does not make insulin, so he relies on his insulin pump to deliver it.
Insulin acts like a special key, unlocking the doors to his body's cells.
Once insulin is released, it travels through the bloodstream to cells all over the body. It attaches to receptors on the cell surfaces, which are like tiny locks. When insulin "unlocks" these cells, it allows the glucose from the blood to move inside. This process is called cellular glucose uptake . With glucose inside the cells, they have the energy to function. Leo's insulin pump delivers the insulin needed to manage this step.
As the cells absorb glucose, the amount of sugar in Leo's blood begins to decrease. His monitor showed his glucose levels slowly returning to a normal range.
But what happens if blood sugar drops too low? That's when another important hormone, glucagon , steps in to help. Glucagon is also made in the pancreas, performing the opposite job of insulin to keep things balanced.