Energy is the ability to effect change. The
describes the thermodynamic laws of energy.
the First rule of thermodynamics
energy can be neither created nor destroyed, during any transformation of the energy remains the same before and after processing. 
II rule of thermodynamics
The disorder tends to increase after a transformation the energy available for work is less energy available before the transformation, it follows that any process of transformation of energy is efficient at 100 %. The total energy is defined
enthalpy (H), the available energy is called free energy (G), energy is represented by unusable '
entropy (S) which is a measure of disorder of a system for temperature T.
H = G + TS You can not measure H, G or S directly, but only through the change with the unit calorie (cal) or Joules (J). The change is indicated by Δ. The change of free energy is the difference between the free energy of the products and reagents. ΔGreazione = Gprodotti - Greagenti
from which ΔG = DH -
TΔS ΔG> 0 → released energy ΔG> 0 → energy required
Energy can be divided into two categories: potential energy
: the energy stored kinetic energy
: energy due to the movement
The sum of all the processes of energy metabolism and body are called can be divided into:
catabolism: the sum of the catabolic reactions, forming complex molecules starting from simple molecules → need energy and reduce the entropy →
exergonic reaction .
anabolism: the sum of the anabolic reactions, starting from simple molecules form complex molecules → give energy and increase entropy →
endoergonica
reaction.
Each reaction has a certain equilibrium point , when a reactant A gives a product B, in principle, by B you can go back to A ( reverse reaction), A ↔ B. The balance point is when ΔG = 0.
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