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Question

Which among the following are reabsorbed actively?
Glucose, amino acids, water, nitrogenous waste, Na+

A
Glucose and amino acids
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B
Nitrogenous wastes only
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C
Glucose, amino acids, Na+
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D
Water, glucose, amino acids, Na+
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Solution

The correct option is C Glucose, amino acids, Na+
Urine formation involves three processes - ultrafiltration, reabsorption and secretion. Reabsorption is necessary to prevent loss of essential nutrients in urine. Around 99 percent of filtrate formed is reabsorbed. Reabsorption can take place in different segments of nephron. The epithelial cells of renal tubule reabsorb these substances either by active or passive mechanisms. Substances like glucose, amino acids, Na+, are reabsorbed by active transport whereas the nitrogenous wastes and water are reabsorbed passively.

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