there are two types of energy
kinetic energy
oxidation - the gain of O2 loss of hydrogen and electrons
reduction - the gain of H2 and electrons loss of oxygen
metabolism - the coupling between the constant need for energy and the supply of nutrients which is intermittent
(constantly need for energy but only have intermittent need for energy)
anabolism - (build up of complex molecules from simpler ones)
catabolism - (breakdown of complex molecules for reabsorption)
there are two nutritional states
absorptive (fed)
postabsorptive (fasting)