Red blood cell blood circulation for about 100 to 120 days (and 80 to 90 days in a full term infant). At the end of their lifespan, they are removed from circulation. In many chronic diseases, the lifespan of the red blood cells is reduced. Erythropoiesis is the process by which new red blood cells are produced; it lasts about 7 days. Through this process red blood cells are continuously produced in the red bone marrow of large bones. (In the embryo, the liver is the main site of red blood cell production.) The production can be stimulated by the hormone erythropoietin (EPO),
The Bones of What You Believe their neon-Eighties visions are far from retro pose-striking." Barry Nicolson of the "NME" praised the album's "great songwriting" and felt that "while not every track has the immediacy of 'Lies' or 'Recover', there's not a weak one among them." Heather Phares of AllMusic wrote, "Even on the darkest moments, such as 'Lies' or 'Science/Visions,' there's a disarming emotional directness to "The Bones of What You Believe" that makes it a unique, fully realized take on a style that seemed close to being played out." Ally Carnwath of "The Observer" commented that Chvrches are "more robust and melodic than arty peers