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Red Blood Cells and No Nucleus?

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 "Red Blood Cells and No Nucleus?"
The red blood cell has no nucleus because with out the nucleus it has more room for hemoglobin to carry as much oxygen as possible. The life span of a red blood cell is also very
http://answers.ask.com/Science/Other/why_do_red_bl...
An RBC has no nucleus , because the nucleus is extruded from the cell as it matures.
http://wiki.answers.com/Q/Why_is_there_no_nucleus_...
Being able to divide requires a nucleus. Since blood cells don't divide,
http://www.chacha.com/question/why-does-a-red-bloo...
Red blood cells are made in the bone marrow. They start out with a nucleus, like other cells, but when they fill up with hemoglobin the nucleus is squished smaller and smaller until
http://answers.yahoo.com/question/index?qid=200612...
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The red blood cell has no nucleus because with out the nucleus it has more room for hemoglobin to carry as much oxygen as possible. The life span of a red blood ...
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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