Blood Flow Accelerator Consistently, 2-3 million RBCs are delivered in the bone marrow and delivered into the course. Otherwise called erythrocytes, RBCs are the most widely recognized kind of cell found in the blood, with each cubic millimeter of blood containing 4-6 million cells. With a measurement of just 6 µm, RBCs are sufficiently little to just barely get through the littlest veins. They flow around the body for as long as 120 days, so, all things considered the old or harmed RBCs are taken out from the dissemination by particular cells (macrophages) in the spleen and liver.