The proximal convoluted tubule (PCT) reabsorbs the majority of sodium from glomerular filtrate:
Percentage reabsorbed: The PCT reabsorbs around 70% of the sodium filtered by the glomerulus.
Role in blood pressure and plasma volume: The PCT's sodium reabsorption helps regulate blood pressure and plasma volume.
Coupled with water reabsorption: Sodium reabsorption is closely linked with water reabsorption, meaning that when sodium moves, water follows.
The PCT reabsorbs sodium through a process called tubular reabsorption. In this process, the nephron removes water and solutes from the tubular fluid and returns them to the blood.
