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ICSE Class 9 Answered

Human red blood cells are circular and biconcave whereas white blood cells are amoeboid- give reason.  
Asked by jaypanchal | 07 Jul, 2021, 09:49: AM
Expert Answer
  • In humans, as in all mammals, the mature RBC lacks a nucleus. This allows the cell more room to store hemoglobin, the oxygen-binding protein, enabling the RBC to transport more oxygen. RBCs are also biconcave in shape; this shape increases their surface area for the diffusion of oxygen across their surfaces.
  • Macrophages, the white blood cellsthat use phagocytosis to rid the body of foreign cells, are amoeboid cells. They change their shape in order to engulf bacteria and other invaders in the body in order to defend the body against diseases and infections.
Answered by Sheetal Kolte | 07 Jul, 2021, 01:36: PM

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