Sodium Ion Movement

In the kidney, the distal convoluted tubules of the nephron contain a filtrate in which the sodium concentration is lower than in the surrounding peritubular capillaries. If sodium ions move from filtrate to blood, what process is at work?

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This question requires a basic understanding of membrane transport mechanisms. When a substance moves against a concentration gradient (from low concentration to high), energy is required. Active transport is the only mechanism capable of moving sodium in the direction described.


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