In physics, the law of<unk>  states that the total amount of<unk>  in any isolated system remains constant but cannot be recreated, although it may change forms, e.g. friction turns kinetic<unk>  into thermal<unk> . In thermodynamics, the first law of thermodynamics is a statement of the<unk>  for thermodynamic systems, and is the more encompassing version of the<unk> . In short, the law of<unk>  states that<unk>  can not be created or destroyed, it can only be changed from one form to another.
Conservation of energy
Energy transformation
Cell signaling
Carbohydrate metabolism
Heat transfer
Control of respiration
Human movement control
Signal transduction