1
Question
Drugs and toxin are mainly excreted by which process?
Drugs and toxin are mainly excreted by which process?
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Solution
The correct option is B Tubular secretion
Tubular secretion is the passage of substances across the tubule epithelium in a direction opposite to that of reabsorption. Secretion occurs mainly in the region of the distal convoluted tubule (DCT) and proximal convoluted tubule (PCT). 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. Toxic substances and alkaloids are also secreted by DCT.
Tubular secretion is the passage of substances across the tubule epithelium in a direction opposite to that of reabsorption. Secretion occurs mainly in the region of the distal convoluted tubule (DCT) and proximal convoluted tubule (PCT). 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. Toxic substances and alkaloids are also secreted by DCT.
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