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| Description: They look like little cinnamon candies here, but they're actually the most common type of blood cell in the human body - red blood cells (RBCs). These biconcave-shaped cells have the tall task of carrying oxygen to our entire body; in women there are about 4 to 5 million RBCs per microliter (cubic millimeter) of blood and about 5 to 6 million in men. People who live at higher altitudes have even more RBCs because of the low oxygen levels in their environment. Picture Stats: Views: 989 Filesize: 49.78kB Height: 438 Width: 599 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=8997 Keywords: red blood cells |