A biconcave disc is a geometric shape characterized by having two concave sides, resembling a disc or a thin, flattened sphere. This shape is commonly associated with red blood cells (erythrocytes) in biology, where the biconcave structure allows for an increased surface area relative to volume. This unique shape facilitates the efficient transport of oxygen and carbon dioxide, as it enhances the cell's ability to deform and navigate through the narrow capillaries in the circulatory system.
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