The part of the nephron involved in the activ | vedclass

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(B) : From the Bowman's capsule,glomerular filtrate enters the proximal convoluted tubule $(PCT)$.Absorption of selected materials takes place from th

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Proximal convoluted tubule

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(B) : From the Bowman's capsule,glomerular filtrate enters the proximal convoluted tubule $(PCT)$.Absorption of selected materials takes place from the filtrate into the blood of the peritubular capillaries or vasa recta,which is termed tubular reabsorption.Reabsorption involves both passive and active transport across the tubular epithelium.About $65$ percent of the glomerular filtrate is normally reabsorbed in the $PCT$ before reaching the loop of Henle.Glucose,amino acids,vitamins,hormones,sodium $(Na^+)$,potassium $(K^+)$,chlorides,phosphates,bicarbonates,much of the water,and some urea are absorbed here.Sodium and potassium are reabsorbed primarily by active transport.

Column-$I$	Column-$II$
$a. PCT$	$i. \text{Selective secretion of } H^+ \text{ and } K^+ \text{ ions}$
$b. DCT$	$ii. 70-80\% \text{ of electrolytes and water reabsorption}$
$c. \text{Descending limb}$	$iii. \text{Allows passage of small amounts of urea}$
$d. \text{Ascending limb}$	$iv. \text{Permeable to water}$
$e. \text{Collecting duct}$	$v. \text{Permeable to salts}$

The part of the nephron involved in the active reabsorption of sodium is

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