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Question

Reabsorption of chloride ions and water from glomerular filtrate in proximal convoluted tubule occur respectively by

A
Active transport, Passive transport
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B
Passive transport, Osmosis
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C
Osmosis, Passive transport
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D
Brownian movement, Diffusion
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Solution

The correct option is B Passive transport, Osmosis
Approximately two-thirds of the NaCl and water filtered into Bowman’s capsule is immediately reabsorbed across the walls of the proximal convoluted tubule. This reabsorption is driven by the active transport of Na+ out of the filtrate and into surrounding peritubular capillaries. Cl follows Na+ passively because of electrical attraction, and water follows them both because of osmosis.

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