Glucagon â Higher tier. The pancreas releases another hormone, glucagon, when the blood sugar levels fall. This causes the cells in the liver to turn glycogen back into glucose which can then be released into the blood. The blood sugar levels will then rise. Now try a Test Bite-Higher tier. Page: 1  1. 2  2. 3  3. 4  4.his causes the cells in the liver to turn glycogen back into glucose which can then be released into the blood. The blood sugar levels will then rise. Now try a Test Bite-Higher tier. Page: 1  1. 2  2.
These birds live as far north as Maine or Nova Scotia, Canada down south through Florida and the Gulf Coast. They range as far west as South Dakota, Nebraska and Texas. They have also been introduced to California, Hawaii and Bermuda. Northern cardinals do not migrate so they live in the same place year-round.
Not all birds migrate, but the majority of birds do. In fact, in North America about 75% of birds migrate. They do this for various reasons, for example, to find a more abundant source of food or a better climate.