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Animal Kingdom
Question
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Mammals have

  • biconvex RBCs to increase the surface area

  • biconcave RBCs to increase the surface area

  • spherical RBCs to increase the surface area

  • no RBCs

Answer

B.

biconcave RBCs to increase the surface area

RBCs of all mammals are mostly biconcave and circular (except camel and llama RBCs, which are oval). Mature mammalian RBCs do not have cell organelles including nucleus, mitochondria, ribosomes, centrioles and ER.

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