<P> Adult humans have roughly 20 -- 30 trillion red blood cells at any given time , constituting approximately 70 % of all cells by number . Women have about 4 -- 5 million red blood cells per microliter ( cubic millimeter ) of blood and men about 5 -- 6 million ; people living at high altitudes with low oxygen tension will have more . Red blood cells are thus much more common than the other blood particles : there are about 4,000 -- 11,000 white blood cells and about 150,000 -- 400,000 platelets per microliter . </P>
<P> Adult humans have roughly 20 -- 30 trillion red blood cells at any given time , constituting approximately 70 % of all cells by number . Women have about 4 -- 5 million red blood cells per microliter ( cubic millimeter ) of blood and men about 5 -- 6 million ; people living at high altitudes with low oxygen tension will have more . Red blood cells are thus much more common than the other blood particles : there are about 4,000 -- 11,000 white blood cells and about 150,000 -- 400,000 platelets per microliter . </P>
how many red blood cells are in the body
how many red blood cells are in the body
20 -- 30 trillion red blood cells
20 -- 30 trillion red blood cells