The simple idea
The engine: the Na⁺/K⁺ pump on the blood side keeps cell sodium low (Concept 5). Sodium then rushes in from the tubule fluid through transporters that drag other substances with it (secondary active transport, Concept 6):
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Part 7 · The Kidneys and Acid–Base
Same concept, other depth: Clinical Reasoning →
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The engine: the Na⁺/K⁺ pump on the blood side keeps cell sodium low (Concept 5). Sodium then rushes in from the tubule fluid through transporters that drag other substances with it (secondary active transport, Concept 6):
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