NEET Biology question
Which of the following statements are correct? (i) Reabsorption of water occurs passively in the initial segment of nephron. (ii) Urea is reabsorbed by diffusion in PCT. (iii) Conditional reabsorption of Na+ and water takes place in DCT. (iv) DCT reabsorbs HCO3-. (v) Filtrate in PCT is isotonic to blood plasma. (vi) Substances like glucose, amino acids, Na+, etc., in the filtrate are reabsorbed actively in PCT.
Solution
Water is indeed passively reabsorbed in the initial PCT segment (i), urea diffuses out along with water in PCT (ii), DCT reabsorption of Na+ and water is conditional/hormone-regulated (iii), DCT does reabsorb HCO3- (iv), the filtrate at the end of PCT is isotonic
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