Red blood cells ( aka ERYTHROCYTES ) are cells that are in the shape of a biconcave disc, 7-8 micrometer in depth. They have a larger TSA/V ratio that increases the rate of gases exchange. It doesn't have a nucleus as it helps to provide more space for haemoglobin to be packed in the cell.
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Sel darah merah mengandungi hemoglobin yg membantu membawa oksigen dengan bergabung dengannya dan membentuk oksihemoglobin