Select the CORRECT statements:i. Tubular secr | vedclass

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(C) Statement $i$ is incorrect because tubular secretion of $H^{+}$ ions occurs primarily in the $DCT$ and $CT$,not the $PCT$.Statement $ii$ is correc

Vedclass · Accepted Answer

$ii$ and $iii$ only

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(C) Statement $i$ is incorrect because tubular secretion of $H^{+}$ ions occurs primarily in the $DCT$ and $CT$,not the $PCT$.Statement $ii$ is correct; tubular secretion (often referred to as augmentation) involves the active secretion of $H^{+}$,$K^{+}$,and ammonia into the filtrate in the $DCT$ and $CT$.Statement $iii$ is correct; by secreting $H^{+}$ ions,the kidneys maintain the acid-base balance and regulate the $pH$ of the blood.Statement $iv$ is incorrect because the glomerular filtrate is typically isotonic and neutral to slightly alkaline,whereas only urine is acidic.Therefore,statements $ii$ and $iii$ are correct.

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