First slide

Urine Formation

Question

During urine formation, tubular cells of the nephron secrete which of the following into the filtrate?

Easy

A

${Na}^{+}$ , $K^{+}$ , ${NH}_{3}$
B

$H^{+}$ , $K^{+}$ , $C_{6} H_{12} O_{6}$
C

$K^{+}$ , ${NH}_{3}$ , $H^{+}$
D

${Na}^{+}$ , $K^{+}$ , ${Cl}^{-}$ , ${HCO}_{3}^{-}$

Solution

During urine formation, tubular cells of the nephron secrete $K^{+}$ , ${NH}_{3}$ and $H^{+}$ into the filtrate (tubular secretion). ${Na}^{+}$ , ${Cl}^{-}$ , ${HCO}_{3}^{-}$ and $C_{6} H_{12} O_{6}$ , are reabsorbed into the blood from the filtrate (selective reabsorption, or tubular reabsorption).

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