Active transport. Transmission of ions or molecules against the slope of their concentrations across the cell membrane, ie, from the lower side to the higher side Concentration using energy

Active transport
the definition:
The transfer of ions or molecules against the slope of their concentrations across the cell membrane from any side of the least concentration to the higher side concentration using energy.
Example:
The neuron and muscle cells control the concentration of sodium and potassium ions, allowing the transfer of nerve impulses required for contraction of the muscle fibers.