Question

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

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

Answer 1

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 $N{a}^{+}$ out of the filtrate and into surrounding peritubular capillaries. $C{l}^{–}$ follows $N{a}^{+}$ passively because of electrical attraction, and water follows them both because of osmosis.