The primary function of the proximal convoluted tubule is

This question lacks options, options are:

A) filtration.

B) absorption of ions, organic molecules, vitamins, and water.

C) secretion of acids and ammonia.

D) secretion of drugs.

E) adjustment of urine volume.

The correct answer is B.

The primary function of the proximal convoluted tubule is absorption of ions, organic molecules, vitamins, and water.

Explanation:

The proximal tubules are part of the nephron, a system that filters the blood that passes through the kidneys. The function of the proximal convoluted tubule can be summarized in three processes: absorption, excretion and control of the acid-base balance of the blood. In the proximal convoluted tubule, all potassium, glucose and amino acids are reabsorbed by active transport, 87.5% of sodium and 40% of urea, filtered by the glomerulus. This absorption is accompanied by the exit of the tubule of 87.5% of the filtered water.