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Question

Choose the incorrect statement from the following statements
I) GFR in a healthy individual is approximately 125 ml/hr.
II) During urine formation, the tubular cells secrete substances like H+, K+ and ammonia into the filtrate.
III) On an average, 1100-1200 ml of blood is filtered by the kidneys per minute.
IV) Substances like glucose, amino acids, Na+ in the filtrate are reabsorbed by passive transport.

A
I and III
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B
I only
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C
II and III
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D
I and IV
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Solution

The correct option is D I and IV
GFR (glomerular filtration rate) is the amount of filtrate formed per minute by the glomerulus of the nephrons in the kidneys. In a healthy person, the GFR is about 125 ml/min which makes 180 liters per day.
In different segments of nephron, the tubular epithelial cells reabsorb substance either actively or passively. Substances like glucose, amino acids, Na+ in the filtrate are reabsorbed actively whereas the nitrogenous wastes are reabsorbed passively.

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