Is erythropoietin released when breaking down RBCs
Erythropoietin is a glycoprotein cytokine (v is wrong) secreted by the kidney (iv is wrong); it stimulates erythrocyte production (erythropoiesis, from multipotent hematopoietic stem cells through erythroblasts through reticulocytes to red blood cells; iii is correct; i and ii are wrong) in the bone marrow.