However, up to 40 per cent of your body's energy goes into supplying the microscopic sodium-potassium pump with the energy it needs. It's not visible to the naked eye and you can't feel it.

This diagram shows molecules moving from area of low concentration to area of high concentration with energy: The proteins pump sodium out of the cells and potassium into the cells. This helps ...

Other proteins found embedded within the membrane act as: pumps - for example the sodium potassium pump that pumps sodium out of the cell and potassium into the cell. pores - which allow ions of a ...

Your forearm might get tired after about 100 squeezes, but your heart must continue to do the work to pump blood ... Enter ...