Red cells are able to proliferate if suffisant conditions are present.
One of the most important is erythropoietin.
Here you see the complexity of this large molecule
Erythropoietin is a hormone that is secreted by tubular cells in the kidney, than flowing to the bone medullae, it is necessary to produce red cells.
This hormone is frequently used as pharmaceutical treatment by cyclist in competitions.
.. But in that condition, it becomes dangerous, because the blood may become too concentrated , and provoque brain or heart injury.
The good therapeutic indication of the treatment is the chronic renal failure, because the sick kidneys are no more able to to produce erythropoietin.
Erythropoietin is than prescribed by nephrologist a only.
Keep your kidney in good health !
Nilufer