In the nephron, the transport of substances like sodium chloride and urea is facilitated by a special arrangement called the counter-current mechanism, which comprises of:

  • A
    Vasa recta and collecting duct
  • B
    Ascending limb and collecting duct
  • C
    Henle's loop and vasa recta
  • D
    Henle's loop and glomerulus

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In the given diagram,what are the regions $P, Q,$ and $R$?
$P \quad\quad Q \quad \quad R$

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