Question

Why rbc are biconcave and circular ?

Answer 1

Answer:

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Red blood cells or Erythrocytes are biconcave because they do not contain NUCLEUS. They are a-nucleated. This provides the cell to attain large surface area to accomodate maximumspace for haemoglobin. ... Efficient gas transport requires erythrocytes to pass through very narrow capillaries, and this. constrains their size.

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Answer 2

RBCs lack nucleus and vaculoes to conserve space to carry huge 4 molecules of O2, by this feature the performance of our respiratory system is improved and proper O2 supply is maintained.