You might see the word alloy described as a mixture of metals, but that's a little bit misleading because some alloys contain only one metal and it's mixed in with other substances that are nonmetals (cast iron, for example, is an alloy made of just one metal, iron, mixed with one nonmetal, carbon).
Energy substrates in the human body are either carbohydrates, fat or proteins. Protein degradation yields amino acid residues which can be converted to carbohydrates and used in energy production. Carbohydrates (sugars) and amino acids from proteins give approximately 4 kcal/gram dry weight when burned in the body.
Enzymes work as catalysts in the body. They speed up reactions that our bodies need to function. An enzyme consists of a substrate and a binding site. The substrate fits onto â¦ the binding site perfectly. Once united the binding site splits the substrate into more usable parts.This helps our body by breaking down substances speedily for further use.hey speed up reactions that our bodies need to function. An enzyme consists of a substrate and a binding site. The substrate fits onto â¦ the binding site perfectly. Once united the binding site splits the substrate into more usable parts. This helps our body by breaking down substances speedily for further use.