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Biconcave disc
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    Biconcave disc

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    A biconcave disc model of a discocyte
    Biconcave disc.svg

    A biconcave disc — also referred to as a discocyte — is a geometric shape resembling an oblate spheroid with two concavities on the top and on the bottom.

    Biconcave discs appear in the study of cell biology, where it is meta-stable, and involves the continuous adjustment of the asymmetric transbilayer lipid distribution, which is correlated with ATP depletion.

    Mathematical model

    A biconcave disc can be described mathematically by

    where z(r) is the height of the surface as a function of radius r, D is the diameter of the disc, and a0, a1, a2 are coefficients describing the shape. The above model describes a smooth surface; actual cells can be much more irregular.

    Biology

    Erythrocytes are in the shape of a biconcave disc. An erythrocyte is also known as a red blood cell and transports oxygen to and from tissues.



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