Blood sugar regulation cells in the pancreatic islets are among the most well understood and important. If the blood glucose level falls to dangerous levels (as during very heavy exercise or lack of food for extended periods), the alpha cells of the pancreas release glucagon, a hormone whose effects on liver cells act to increase blood glucose levels. They convert glycogen into glucose (this process is called glycogenolysis). The glucose is released into the bloodstream, increasing blood sugar. Hypoglycemia, the state of having low blood sugar, is treated by restoring the blood glucose level to normal by the ingestion or administration of dextrose
Regulating factors the cycle would start over. Therefore, food is a regulating factor in this scenario, as food supply keeps the population at relative equilibrium. All regulating factors are density-dependent, meaning they keep populations at equilibrium by counteracting fluctuations in population size per unit area (or per unit volume for species living within three dimensional environments, such as water). Other regulating factors of the human population at present are drinking water supply, amount of arable land (obviously a more fundamental term for food), air pollution and prevalence of communicable disease. The major regulating factor for the human population in current times is