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testosterone
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testosterone and its effects on human development and behaviour
biosynthesis of steroid hormones
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testosterone

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Written by
Robert D. Utiger
Clinical Professor of Medicine, Harvard Medical School.
Robert D. Utiger
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The Editors of Encyclopaedia Britannica
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. They write new content and verify and edit content received from contributors.
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Percy Julian

testosterone, hormone produced by the male testis that is responsible for development of the male sex organs and masculine characteristics, including facial hair and deepening of the voice. Testosterone was isolated from testicular extracts in 1935. Its discovery followed that of an androgen (male hormone) called androsterone, which was isolated from urine in 1931. However, testosterone proved to be more potent than androsterone, which was later shown to be a biochemical product (a metabolite) of testosterone. A healthy man produces about 5 mg (1.8 × 10−4 ounces) of testosterone daily. Testosterone serves as a circulating prohormone for a more active ...(100 of 416 words)

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