A reduced blood flow to the kidneys
increased demand for oxygen
The exact word for this would be ''erythropoiesis''.
Kidneys
Erythropoietin (EPO) primarily targets the bone marrow to increase erythropoiesis, which is the production of red blood cells. It stimulates the differentiation of progenitor cells into erythrocytes and promotes their maturation. EPO is produced mainly by the kidneys in response to low oxygen levels in the blood.
Erythropoiesis requires B12, Folic acid and iron.
Erythropoiesis, or the production of red blood cells, is triggered by hypoxia or low oxygen levels in the body. This stimulates the release of erythropoietin, a hormone produced by the kidneys, which acts on the bone marrow to increase the production of red blood cells in order to help transport more oxygen to body tissues.
Hemorrhage or living at high altitude
No
vitamin K
thalassemia
Anemia