Source: Blood Count image, Public Domain: http://en.wikipedia.org/wiki/File:ABO_blood_group_diagram.svg; Eurythropoietin image, Public Domain: http://en.wikipedia.org/wiki/File:Illu_blood_cell_lineage.jpg
Cells found in the blood that carry oxygen and carbon dioxide.
Another word for red blood cells.
The number of red blood cells in a microliter of blood.
A hormone secreted by the kidneys when oxygen levels in blood are too low to stimulate bone marrow to produce more red blood cells.