Laws of Thermodynamics
Energy flows in a one-way path through biological systems and eventually into some low-temperature sink such as outer space. Two laws of thermodynamics describe the behavior of energy. The first law of thermodynamics states that energy is conserved; that is, it is neither created nor destroyed under normal conditions. It may be transferred from one place or object to another, but the total amount of energy remains the same. Similarly, energy may be transformed, or changed from one form to another (e.g. from the energy in a chemical bond to heat energy), but the total amount is neither diminished nor increased.
CMP Bio World 