Which of the following is reabsorbed in the proximal tubule, leading to a reduction in the overall filtrate volume?

Select the two that apply

a) interstitial fluid

b) solutes

c) water

d) urea

The correct answers are options b) "solutes" and c) "water".

Explanation:

The proximal tubule is a filtration structure found in the nephron in kidneys. The proximal tubule has functions of absorption and excretion, producing a filtrate that is of a minor volume. In order to achieve a minor volume, a percentage of the filtrate is reabsorbed in the proximal tube. Of the total volume that enters the proximal tubule, two thirds of water and salt is reabsorbed, while practically all the organic solutes are reabsorbed.