| A | B |
|---|
| puberty | period of rapid physical growth and sexual maturation that ends childhood |
| GH | hormone that increases steadily during puberty in both sexes |
| testosterone | hormone that increases dramatically in boys during puberty |
| estrogen | hormone that increases dramatically in girls during puberty |
| growth spurt | first sign in increased bone length and density |
| primary sex characteristics | the sex organs involved in reproduction |
| menarche | onset of menstruation |
| spermarche | first ejaculation containing sperm |
| secondary sex characteristics | physical characteristics not involved in reproduction |
| body image | attitude toward one's physical appearance |
| drug abuse | ingestion of a drug to the extent that it impairs the user's well-being |
| drug addiction | dependence on a drug in order to feel at ease. |
