Question

Which of the following statements are correct?

(i) Re-absorption of water occurs passively in the initial segment of nephron.
(ii) Nitrogenous wastes are absorbed by passive transport.
(iii) Conditional re-absorption of $N{a}^{+}$ and water takes place in DCT.
(iv) DCT reabsorbs $HC{O}_3$
(v) DCT is capable of selective secretion of $H^{+}$ , $K^{+}$, and $N{H}_3$ to maintain $pH$ and $N{a}^{+}-K^{+}$ balance in blood.

• A. (i) and (ii)
• B. (ii) and (iii)
• C. (iv) and (v)
• D. All of these

Answer 1

The correct option is D All of these

• Water passively reabsorbed from the PCT.
• Excretory wastes like ammonia, urea, and uric acid get reabsorbed into the PCT.
• The DCT contains cells that can absorb sodium and calcium ion and water by the action of hormones.
• DCT reabsorbs $HC{O}_3^{-}$, $N{a}^{+}$,. $K^{+}$, $N{H}_3$ to balance the pH and the $N{a}^{+}$- $K^{+}$ balance.
• So, All of the given options are correct and therefore option (D) is correct.
• DCT