Question

By which of the following mechanisms is glucose reabsorbed from the glomerular filtrate by the kidney tubule?

• A. Osmosis
• B. Diffusion
• C. Active transport
• D. All of the above

Answer 1

The correct option is C Active transport

The glomerular filtrate after ultrafiltration enters the proximal convulated tubule (PCT). About 65% of the glomerular filtrate is normally reabsorbed in PCT before it reaches the loop of Henle. These include glucose, amino acids, vitamins, hormones, sodium, potassium, chlorides, bicarbonates, most of the water and some urea. Out of these,

• Na${}^{+}$ and K${}^{+}$ are reabsorbed through the active transport.

• Glucose and amino acids are reabsorbed through secondary active transport using a co-transporter with sodium.

• Reabsorption of water takes place through osmosis.

• Cl${}^{-}$, urea and other solutes are reabsorbed through simple diffusion.

So, the correct answer is 'Active transport'.