Question

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Answer 1

Answer:

RBCs are disc-shaped with a flatter, concave center. This biconcave shape allows the cells to flow smoothly through the narrowest blood vessels. ... Many RBCs are wider than capillaries, but their shape provides the needed flexibility to squeeze through.

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Answer 2

Answer:

Their shape allows red blood cells to flow through very narrow blood vessels and the disc shape increases the surface area of the cell membrane for oxygen to diffuse across.