This is an important area of metabolic biology to understand. In non-diabetics, your blood sugar levels should be between 3.9 and 7.1 mmol/L (the unit shows that this is a concentration as it is how many mmols are in a litre). Without us having to do anything, when our blood glucose level rises (after eating a meal, for example) the beta cells in the islets of Langerhans in the pancreas release insulin into the blood. This causes the body's cells to take up more glucose and the liver to take up glucose and store it as glycogen. As a consequence our blood glucose level declines. On the other hand, if we skip a meal and our blood glucose level drops, this causes the alpha cells in the islets of Langerhans in the pancreas to release glucagon which tells the liver to break down glycogen and releases glucose into the blood. Consequently the blood glucose level rises. The antagonistic effects of insulin and glucagon help maintain the blood glucose level in the aforementioned window - this is an example of homeostasis.Maybe link them to a diagram so that they can see it.Discussion about diabetes mellitus and how type 1 diabetics are not able to produce insulin so they require it exogenously.

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