Red blood cells are the components of the circulatory system that transports gases in and out of the cells. They are also called erythrocytes and travels in the blood through the veins and arteries.
Exception of mature red blood cells is that all cells in the body have a nucleus.
The exception in the red blood cells can be explained as:
- All the eukaryotic cells have a nucleus in their cells except mature RBC's. The RBC's shed off their nucleus and other organelles before entering the bloodstream.
- The lack of a nucleus is due to the transportation of gases. RBC shed nuclei and other organelles so that they can carry more hemoglobin and oxygen in the body cells.
Therefore, blood cells lack a nucleus.
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