The blood glucose homeostasis is the balance between the hoemones insulin and glucagon to maintain the levels of glucose free in the blood at 90mg/mL in a regular state. The insulin hormone is responsible to reduce the levels of blood glucose when it is elevated after a meal, the beta cells of the pancreas are the one that produce and release that hormone in the blood after receiving chemical signals from the body. While the glucagon is the hormone that will liberate the glucose (stored as glycogen in the liver) to the blood when the levels of this molecule are low. That balance between the two hormones is what ensures the levels of blood glucose to be in a homeostasis with the organisms needs.