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Discussion

Cells specialised for absorption, such as those lining the small intestine, increase their exchange capacity by

  • A.storing more mitochondria in the nucleus
  • B.folding the membrane into microvilli
  • C.increasing their overall cell volume
  • D.reducing the thickness of the cell wall

Answer: B

A brush border of microvilli multiplies the membrane area many times without enlarging the cell. It is the standard solution to the surface-to-volume limit wherever exchange has to be maximised, and the same trick appears in the kidney tubule.

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