Henle's Loop Permeability — NEET Biology
📚 Practice ConceptAscending limb of Henle's loop is _______ to water whereas the descending limb is ______ to it.
The given figure shows reabsorption and secretion of major substances at different parts of the nephron. The movement of which of the following substances is wrongly depicted?
View solution & NCERT explanation
Correct answer: B — NaCl and NH₃ at PCT
Proximal convoluted tubule (PCT): Reabsorbs glucose, amino acids, NaCl, HCO₃⁻, and water; it also secretes H⁺ and NH₃, not reabsorbs them. Thus, showing NH₃ reabsorbed is wrong. Distal convoluted tubule (DCT): Performs conditional reabsorption of NaCl and water, and secretion of H⁺, K⁺, NH₃ → correctly depicted. Ascending limb of Henle’s loop: Impermeable to water, actively reabsorbs NaCl → correctly depicted. Descending limb of Henle’s loop: Permeable to water, reabsorbs H₂O → correctly depicted. Hence, the error is NH₃ at PCT.
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