A combustion reaction is when a substance reacts with oxygen and releases a huge amount of energy in the form of light and heat. A combustion reaction always has oxygen as one reactant.The second reactant is always a hydrocarbon, which is a compound made up of carbon and hydrogen. combustion reaction is when a substance reacts with oxygen and releases a huge amount of energy in the form of light and heat. A combustion reaction always has oxygen as one reactant. The second reactant is always a hydrocarbon, which is a compound made up of carbon and hydrogen.
Another important effect of iron in heme metabolism is its role in the accumulation of uro-and hepta-carboxyl porphyrins in the liver known to occur in porphyria cutanea tarda (PCT). 14 Most patients with PCT have a moderate increase of liver iron, which seems to play a role in the pathogenesis of the disease.
Iron is: 1  An essential mineral. 2  A carrier of oxygen in the body. 3  Necessary to make hemoglobin. 4  Found in every cell of the body.