The increase in osmolarity from outer to inne | vedclass

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(A) The correct answer is option $(A)$ because both statements $(i)$ and $(ii)$ are correct.The counter current mechanism is based on the close proxim

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$(i)$ and $(ii)$

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(A) The correct answer is option $(A)$ because both statements $(i)$ and $(ii)$ are correct.The counter current mechanism is based on the close proximity and the parallel arrangement of the Henle's loop and the vasa recta.This mechanism helps in maintaining a concentration gradient in the medullary interstitium,which is essential for the concentration of urine.Statement $(iii)$ is incorrect because the $PCT$ (Proximal Convoluted Tubule) is involved in the selective secretion of $H^{+}$,ammonia,and $K^{+}$ ions,and the reabsorption of $HCO_{3}^{-}$,but it does not contribute to the medullary osmotic gradient.Statement $(iv)$ is incorrect because the high blood pressure in the glomerular capillaries is responsible for the process of glomerular filtration,not for the counter current mechanism.

Similar Questions

Medullary gradient is mainly developed due to

In vertebrates,the ability to produce concentrated urine is generally associated with the ............ .

Which of the following plays a significant role in maintaining the high osmolarity of the medullary interstitial fluid?

Name the following:
$A$ loop of capillary running parallel to the Henle's loop.

The concentration of urine depends upon which part of the nephron?

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