Biology and You

You and Your Cells

What is the most common blood cell in the human body?

Red blood cells, also known as erythrocytes, are the most common blood cells. A milliliter (ml) of blood contains approximately five billion red blood cells. The average person has a total of twenty-five trillion red blood cells in their bloodstream! Red blood cells are very small; it would take a string of 2,000 red blood cells to circle a pencil.

Scientists hope that stem cells will one day help cure genetic and other injuries in which cell regeneration is crucial, such as spinal injuries.


This is a web preview of the "The Handy Biology Answer Book" app. Many features only work on your mobile device. If you like what you see, we hope you will consider buying. Get the App