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| Description: Red blood cells (erythrocytes) contain the protein hemoglobin that is used to carry oxygen to all cells and to carry 23% of total carbon dioxide to the lungs. Each hemoglobin molecule contains an iron ion which allows each molecule to bind four oxygen molecules. Red blood cells have no nucleus or other organelles and are biconcave discs. The lack of a nucleus and the shape allow the cells to efficiently carry oxygen. Picture Stats: Views: 157 Filesize: 882.2kB Height: 532 Width: 1350 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=40771 |