Drugs and toxin are mainly excreted by which of the following process?

Ultra–filtration

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Digestion in the form of excreta

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Tubular secretion

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Diffusion

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Solution

The correct option is C Tubular secretion
Tubular secretion is the passage of substances across the tubule epithelium in a direction opposite to that of reabsorption. Potassium, hydrogen ions, and ammonium ions, as well as some organic ions such as creatinine (a metabolic waste), are secreted into the filtrate. Certain drugs, such as penicillin, are also removed from the blood by secretion.

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