MCQ
The increase in osmolarity from outer to inner medullary interstitium is maintained due to :
$(i)$ Close proximity between Henle's loop and vasa recta
$(ii)$ Counter current mechanism
$(iii)$ Selective secretion of $HCO _{3}^{-}$ and hydrogen ions in PCT
$(iv)$ Higher blood pressure in glomerular capillaries
$(i)$ Close proximity between Henle's loop and vasa recta
$(ii)$ Counter current mechanism
$(iii)$ Selective secretion of $HCO _{3}^{-}$ and hydrogen ions in PCT
$(iv)$ Higher blood pressure in glomerular capillaries
- ✓$(i)$ and $(ii)$
- BOnly $(ii)$
- C$(iii)$ and $(iv)$
- D$(i), (ii)$ and $(iii)$