Single Choice

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 $$Na^{+}$$ and water takes place in DCT. (iv) DCT reabsorbs $$HCO_{3}$$ (v) DCT is capable of selective secretion of $$H^{+}$$ , $$K^{+}$$, and $$NH_{3}$$ to maintain $$pH$$ and $$Na^{+} - K^{+}$$ balance in blood.

A(i) and (ii)
B(ii) and (iii)
C(iv) and (v)
DAll of these
Correct Answer

Solution

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 $$HCO_3^-$$, $$Na^+$$,. $$K^+$$, $$NH_3$$ to balance the pH and the $$Na^+$$- $$K^+$$ balance.
So, All of the given options are correct and therefore option (D) is correct.
DCT

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