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(A) In the nephron,the descending limb of the Loop of Henle is permeable to water but nearly impermeable to electrolytes. Therefore,water is reabsorbe

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$H_2O \quad NaCl \quad NaCl$

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(A) In the nephron,the descending limb of the Loop of Henle is permeable to water but nearly impermeable to electrolytes. Therefore,water is reabsorbed from the filtrate into the medullary interstitium,which is represented by $P = H_2O$.The ascending limb of the Loop of Henle is impermeable to water but allows the transport of electrolytes. In the thick segment of the ascending limb,$NaCl$ is actively transported out of the filtrate,represented by $Q = NaCl$.In the thin segment of the ascending limb,$NaCl$ is transported out by diffusion,represented by $R = NaCl$.Thus,$P = H_2O$,$Q = NaCl$,and $R = NaCl$.

The following figure shows the reabsorption and secretion of major substances in different parts of the nephron. What do $P$,$Q$,and $R$ represent?
$P \quad\quad Q \quad\quad R$

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The following figure shows the reabsorption and secretion of major substances in different parts of the nephron. What do $P$,$Q$,and $R$ represent?$P \quad\quad Q \quad\quad R$