Why is sodium a benefit for the human body?

Answer 1

Salt is naturally known to absorb water and is used through out the body as a mechanism to retain water and to effectively absorb and transport it. This mechanism is shown well through a nephron ( kidney cell ) as the waste passes through the nephron the water is absorbed by the salt so we don't have to go to the toilet every 5minutes

also the sodium, when working as an antagonist with potassium around a cell, stops the cell from becoming flaccid.