All the glucose in the filtrate is normally reabsorbed in the

Explanation

The proximal tubule cells carry microvilli and many mitochondria because glucose and amino acids are recovered here by active transport, along with most of the water and salts. Reabsorption is described as selective because useful substances are taken back while urea is largely left behind. The collecting duct handles the final water adjustment under the control of ADH, not glucose recovery.