Give an account of the biological importance of `Na^(+)` and `K^(+)` ions.

Explanation

Biological importance of sodium : (1) `Na^(+)` ions help in the transmission of nerve signals . (2) `Na^(+)` ions help in regulating the flow of water across the cell membranes . (3) `Na^(+)` ions help in transporting sugars and amino acids into the cells .
Biological importance of potassium : (1) `K^(+)` ions help in activating many enzymes . (2) `K^(+)` ions participate in oxidising glucose to produce ATP . (3) They also help in transmitting nerve signals .