<P> Testosterone is a steroid from the androstane class containing a keto and hydroxyl groups at the three and seventeen positions respectively . It is biosynthesized in several steps from cholesterol and is converted in the liver to inactive metabolites . It exerts its action through binding to and activation of the androgen receptor . In humans and most other vertebrates , testosterone is secreted primarily by the testicles of males and , to a lesser extent , the ovaries of females . On average , in adult males , levels of testosterone are about 7 to 8 times as great as in adult females . As the metabolism of testosterone in males is greater , the daily production is about 20 times greater in men . Females are also more sensitive to the hormone . </P>
<P> Testosterone is a steroid from the androstane class containing a keto and hydroxyl groups at the three and seventeen positions respectively . It is biosynthesized in several steps from cholesterol and is converted in the liver to inactive metabolites . It exerts its action through binding to and activation of the androgen receptor . In humans and most other vertebrates , testosterone is secreted primarily by the testicles of males and , to a lesser extent , the ovaries of females . On average , in adult males , levels of testosterone are about 7 to 8 times as great as in adult females . As the metabolism of testosterone in males is greater , the daily production is about 20 times greater in men . Females are also more sensitive to the hormone . </P>
where is testosterone secreted in the body of the human male
where is testosterone secreted in the body of the human male
the testicles
the testicles