alleryTubular secretion is the active transfer of substances from blood into the
ATubule lumen for excretion in urine
BLiver for storage as glycogen only
CStomach for digestion of proteins
DHeart for circulation through the body
Answer & Solution
Correct answer: A. Tubule lumen for excretion in urine
1. After reabsorption, some wastes still in blood are sent into the tubule.
2. Examples include extra K+ ions, drugs and creatinine.
3. This active step is tubular secretion.
4. So option A is correct.
_Source: Selina Concise Biology Class 10, Ch 8 The Excretory System (Mistral OCR'd PDF), section on tubular secretion_
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