Red Blood Cells

Red blood cells are shaped like flat disks with a dent in the middle. A normal red blood cell is 6-8 µm. The cells are typically found in veins, arteries, and the heart. The main function of red blood cells are to transport oxygen to the rest of the body and to carry carbon dioxide back to the lungs. The also help control the pH of blood.

Red blood cells do not have the same organelles as a typical eukaryotic cell. These types of cells lack a nucleus, and therefor have no DNA. Red blood cells actually have no organelles; the only thing these types of cells have are cytoplasm and a cell membrane. Red Blood cells, and other types of blood cells, are classified as connective tissue. 

Works Cited:

https://www.flickr.com/photos/53921113@N02/5645665364

http://www.wadsworth.org/chemheme/heme/microscope/rbc.htm

http://www.newworldencyclopedia.org/entry/Red_blood_cell