My best friend hasn't cam to school since last week and I try to call her but she nvermind picks up I come to her house she's not home where is she Im really worried and my teachers bday is soon and I don't know what to give her oh dear here comes my mum to take me shopping for my teachers present.
Erythropoiesis (from Greek 'erythro' meaning red and 'poiesis' meaning to make) is the process which produces red blood cells (erythrocytes). It is stimulated by decreased O 2 in circulation, which is detected by the kidneys, which then secrete the hormone erythropoietin.
Erythropoietin is a hormone which is produced predominantly by specialised cells in the kidney. Once it is made, it acts on red blood cells to protect them against destruction. At the same time it stimulates stem cells of the bone marrow to increase theproduction of red blood cells.