The name ‘protein’ is derived from the Greek word ‘proteins’, meaning primary, and indicates the importance of this class of compound in all forms of living matter. All living cells contain protein, and muscle tissue is primarily protein.
Proteins may be defined as substances composed principally of amino acids, chemically combined. Carbon, Hydrogen, Nitrogen, Oxygen, Sulphur, and in a few instances, Phosphorus are the elements present in proteins.
The richest sources of protein are lean meat, cheese, and eggs. Cow’s milk contains approximately 3.55 percent protein. Other foods contain protein in varying amounts.
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