When Na⁺ is actively transported from tubular cells to the interstitial fluid, A) no energy is needed. B) glucose and amino acids are countertransported at the same time. C) Na⁺ concentration gradient is established between the tubule lumen and tubule cell. D) water is countertransported by carrier molecules. E) water is secreted.

Question

Quizplus · Accepted Answer

The active transport of Na⁺ (presumably a typographical representation of sodium and another substance) from tubular cells to the interstitial fluid establishes a concentration gradient between the tubule lumen and tubule cell, as active transport typically moves substances against their concentration gradient, requiring energy and thus establishing a gradient.

When Na+ Is Actively Transported from Tubular Cells to the Interstitial

When Na⁺ Is Actively Transported from Tubular Cells to the Interstitial