Biology video podcast: http://sciencesauceonline.com/biologypodcast Subscribe to the podcast on iTunes: https://itunes.apple.com/gb/podcast/biology-by-science-sauce/id1204827854?mt=2 Twitter: https://twitter.com/science_sauce Blood glucose levels must remain relatively constant. When glucose levels in the blood rise the pancreas secretes insulin, which tells the liver to convert glucose to glycogen and store it, thus returning glucose levels back to normal. When glucose levels fall, the pancreas recognises this change and secretes glucagon. Glucagon is a hormone that causes the liver to convert glycogen to glucose and release it, thus raising the blood glucose level back to normal. A person with diabetes doesn’t have an effective mechanism for blood glucose control. Type 1 diabetes is when the immune system attacks the cells in the pancreas that secrete insulin. Type 2 diabetes is when the bodies cells don’t respond correctly to insulin.