| Term | Definition |
|---|
| puberty | a rapid period of physical maturation involving horomonal and bodily changes that take place primarily in early adolescence. |
| hormones | powerful chemicals secreted by the endocrine glands and carried through the body by the bloodstream. |
| androgens | the main class of male sex hormones. |
| estrogens | the main glass of female sex hormones. |
| adrenarche | puberty phase involving hormonal changes in the adrenal glands, located just above the kidneys. These changes occur from about 6 to 9 years old in girls and about one year later in boys, before what is generally considered the beginning of puberty. |
| gonadarche | puberty phase involving the maturation of primary and secondary sexual characteristics. |
| menarche | a girl's first menstrual period. |
| spermarche | a boy's first ejaculation of semen. |
| secular tends | patterns of the onset of puberty over historical tie, especially cross generations. |
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