If you place a drop of blood on a microscope slide and examine it with a powerful microscope, you will see many red shapes that look something like circular disks. these are red blood cells, which carry the oxygen you need throughout your body. are red blood cells the only cells in your body? a) no, blood cells and bone cells are both required. b) yes, the many types of blood cells make up your body. c) no, the human body is made of many types of tiny cells. d) yes, the human body is made entirely of red blood cells.