What is Testosterone? Hormones are chemical substances that control functioning of organs, directing many processes from growth to reproduction including sexual development in both sexes. How energy is stored & used in the body, fluid-level, salt & sugars in blood are also regulated by hormones. Although they are secreted in minute quantities, they play a large role in how a body functions. testosterone is the primary male hormone responsible for sexual development, building muscle & bone mass, body hair, deepening voice, while vital to the development of testes and prostrate - male reproductive organs. The amount of hormone produced varies from in the womb to end of life and plays a crucial role in every stage of a man’s life. Where it begins and where it ends Master-minded by the hypothalamus in the brain, interpreted by the pituitary glands and executed by the testes which produces testosterone and sperm in males. The leyd...