Which of the following best describes sodium movement in the distal tubule?
A) Sodium is transported across the apical membrane by the Na+/K+ pump and across the
basolateral membrane by diffusion through sodium channels.
B) Sodium is transported across the basolateral membrane by the Na+/K+ pump and across the apical membrane by facilitated diffusion.
C) Sodium is transported across the apical membrane by the Na+/K+ pump and across the basolateral membrane by secondary active transport.
D) Sodium is transported across the apical membrane by the Na+/K+ pump and across the basolateral membrane by facilitated diffusion.
E) Sodium is transported across the basolateral membrane by the Na+/K+ pump and across the apical membrane by diffusion through sodium channels.
Answer: E) Sodium is transported across the basolateral membrane by the Na+/K+ pump and across the apical membrane by diffusion through sodium channels.
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