Why dothe red blood cells of the human body do not have a nucleus ?
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Red blood cells are initially produced in the bone marrow with a
nucleus. They then undergo a process known as enucleation in which their
nucleus is removed. Enucleation occurs roughly when the cell has reached
maturity.
The absence of a nucleus helps the red blood cell to carry on
its role of the ‘oxygen-transporter’ in a far more efficient way. It allows the
red blood cell to contain more hemoglobin and, therefore, carry more oxygen
molecules.
It also allows the cell to have its distinctive bi-concave shape
which aids diffusion. This shape would not be possible if the cell had a
nucleus in the way. Because of the advantages it gives, it is easy to see why
evolution would cause this to occur.
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