A protein by structure is a long chain of the amino acids. Every protein has its unique combination of amino acids and structural arrangements. These arrangements decide to which part of the body the protein will be applied to. Food is the main source of protein for the human body. The food consumed by us has essential and nonessential amino acids. Among these the cells absorb the essential ones only.

A hormone is substance secreted by the gland and is essential for the human body. The main production of hormones takes place in the endocrine system, autocrine and paracrine systems. These hormones communicate from one cell to another. They play a very important role in several aspects of the human body like cell division and growth.

There are different types of hormones. They are proteins, peptides and steroids. The hormones travel through the blood stream and reach the cells. For a cell in the body to absorb the particular hormone they need its receptor. Protein is a type of hormone that contains amino acids. There are several kinds of protein hormones like the human growth hormone for example. These hormones affect the day to day living of the human beings.

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