The majority of sodium reabsorption occurs at the proximal convoluted tubule. during this process, sodium enters the tubule cells at the luminal membrane.
Tubular reabsorption is the process that moves solutes and water out of the filtrate and back into your bloodstream.
This process is known as reabsorption, because this is the second time they have been absorbed; the first time being when they were absorbed into the bloodstream from the digestive tract after a meal.
Most of the reabsorption of solutes necessary for normal body function, such as amino acids, glucose, and salts, takes place in the proximal part of the tubule.
This reabsorption may be active, as in the case of glucose, amino acids, and peptides, whereas water, chloride, and other ions are passively reabsorbed.
Learn more about re-absorption here:
