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Red blood cells or erythrocytes are one of the simplest cells in the human body. The basic cell is really no more than a membrane, containing hemoglobin. The cell is bi-concave or in a "doughnut" shape, however, unlike most cells, they do not have a nucleus nor any mitochondria. The cells basic function is to carry oxygen to cells and carbon dioxide away, this is where the hemoglobin comes into play. The hemoglobin bonds to the oxygen or carbon dioxide, carrying it to or from the cell.

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Q: What is red blood cell's anatomy and functions?
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