Which one of the following substances is actively secreted into the glomerular filtrate of the kidney tubule?

Potassium ions

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Amino acids

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Sodium ions

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Chloride ions

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Solution

The correct option is A Potassium ions
In the ascending limb of the loop of Henle, there are sodium-potassium ATPase pumps. The sodium ions are extracted from the filtrate and replaced in the filtrate by the secreted potassium ions.
So, the correct answer is option A.

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