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Why don't red blood cells have nuclei?

Answer

Red blood cells are the only cells in the human body that don't have a nucleus. This is an adaptation which allows the red blood cell to carry more oxygen, but the down side is that the cell cannot replicate itself. The iron in the body is used to make new red cells, which is why iron is such an important part of a person's diet.
1 Additional Answer
Because they don't need one. The nucleus of a cell is responsible for cellular activity including cell division. Blood cells don't divide, they are produced by other cells within bone marrow. RBC's are mainly a cell membrane surrounding a glob of hemoglobin and they lack most of the organelles associated with living cells.
Q&A Related to "Why don't red blood cells have nuclei?"
because they need more space for haemoglobin to carry oxygen. red blood cells have nuclei during their early stages of development, but extrude them as the cells mature, provinding
http://wiki.answers.com/Q/Why_do_red_blood_cells_h...
In the red cells of the mammalians, the lack of nucleus allows more room
http://www.chacha.com/question/why-do-red-blood-ce...
Short answer: That's the way we have evolved to transport oxygen. Long answer: Their function is extremely simple, they act as little more than over-sized vesicles that carry chemicals
http://answers.yahoo.com/question/index?qid=201110...
They lack a nucleus and most other organelles to give the cytoplasm more surface area to allow for the most hemoglobin possible. It is the structure of the entire cell that helps
http://answers.yahoo.com/question/index?qid=201208...
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Red blood cells have no nucleus because their main function is to carry oxygen. With no nucleus they have more room in order to do this. You can find more information ...
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