With the numerous imbalances that happen in the body, homeostasis maintains an equilibrium for the body to continuously function. It can occur in the kidneys, where it controls the homeostasis of water and ions, in the liver, where the metabolic functions take place, and in the cardiovascular system, where the homeostatic regulation of blood circulation occurs. For example, one of the imbalances in the cardiovascular system is when there is low blood, which results in a decrease in oxygen. The kidneys will be activated to release a hormone to control the production of red blood cells in the bone marrow. Then, the bone marrow will generate more red blood cells. The production of red blood cells will result in an increased count, therefore, increasing the oxygen needed by the body cells.